program lab1;
var
  a, b, h, x, y : extended;
begin
  write('Введите начальное значение аргумента: ');
  readln(a);
  write('Введите конечное значение аргумента: ');
  readln(b);
  write('Введите шаг прирощения аргумента: ');
  readln(h);

  x := a;
  repeat
    if (x <= 0) or (abs(x - 5) < 0.0000001) then writeln('x = ', x:0:5, ' y = undefined')
    else if x > 0 then
      begin
        if x < 5 then
          if (exp(ln(x) / 7) - exp(ln(2 / (5 - x)) / 3) > 0)
            and (abs(ln(exp(ln(x) / 7) - exp(ln(2 / (5 - x)) / 3))) > 0.0000001) then
              begin
                y := ((x + 5) / x - exp(x / 3)) / ln(exp(ln(x) / 7) - exp(ln(2 / (5 - x)) / 3));
                writeln('x = ', x:0:5, ' y = ', y:0:5);
              end
          else writeln('x = ', x:0:5, ' y = undefined')
        else if (exp(ln(x) / 7) + exp(ln(2 / (x - 5)) / 3) > 0)
          and (abs(ln(exp(ln(x) / 7) + exp(ln(2 / (x - 5)) / 3))) > 0.0000001) then
            begin
              y := ((x + 5) / x - exp(x / 3)) / ln(exp(ln(x) / 7) + exp(ln(2 / (x - 5)) / 3));
              writeln('x = ', x:0:5, ' y = ', y:0:5);
            end
        else writeln('x = ', x:0:5, ' y = udefined');
      end;
    x := x + h;
  until (x >= b) or (abs(x - b) < 0.0000001);
  x := b;

  if (x <= 0) or (abs(x - 5) < 0.0000001) then writeln('x = ', x:0:5, ' y = undefined')
    else if x > 0 then
      begin
        if x < 5 then
          if (exp(ln(x) / 7) - exp(ln(2 / (5 - x)) / 3) > 0)
            and (abs(ln(exp(ln(x) / 7) - exp(ln(2 / (5 - x)) / 3))) > 0.0000001) then
              begin
                y := ((x + 5) / x - exp(x / 3)) / ln(exp(ln(x) / 7) - exp(ln(2 / (5 - x)) / 3));
                writeln('x = ', x:0:5, ' y = ', y:0:5);
              end
          else writeln('x = ', x:0:5, ' y = undefined')
        else if (exp(ln(x) / 7) + exp(ln(2 / (x - 5)) / 3) > 0)
          and (abs(ln(exp(ln(x) / 7) + exp(ln(2 / (x - 5)) / 3))) > 0.0000001) then
            begin
              y := ((x + 5) / x - exp(x / 3)) / ln(exp(ln(x) / 7) + exp(ln(2 / (x - 5)) / 3));
              writeln('x = ', x:0:5, ' y = ', y:0:5);
            end
        else writeln('x = ', x:0:5, ' y = undefined');
      end;

  writeln('Нажмите enter для завершения...');
  readln;

end.