var fo,fi:text;
    x,y,z:longint;
    f : boolean;

begin
  fi:=input;
  fo:=output;
  readln(fi,x,y,z);
  if (x=y)
  then begin
    if (x=z)
    then f:=true
    else f:=false;
  end else begin
    if (z-x) mod (y-x) = 0
    then begin
      if (z-x) div (y-x) >= 0
      then f:=true
      else f:=false;
    end else begin
      f:=false;
    end;
  end;

  if f
  then writeln(fo,'Yes')
  else writeln(fo,'No');

  close(fi);
  close(fo);
end.