C + Asm

#include <stdio.h>

short assembler(char px, short py, char pz)
{
  int x = px, y = py, z = pz;
  __asm__ ( "addl $7, %%eax;"     // eax += 7
            "imul $7, %%eax;"     // eax *= 7
            "subl %%ebx, %%eax;"  // eax -= ebx
            "imul $3, %%ecx;"     // ecx *= 3
            "subl $1, %%ecx;"     // ecx -= 1
            "movl $0, %%edx;"     // edx = 0
            "idivl %%ecx;"        // edx:eax / ecx => eax
            "addl $2, %%eax;"     // eax += 2
            : "=a" (x) : "c" (x) , "b" (y), "a" (z) );
            /*
              Input: z => eax, y => ebx, x => ecx
              Output: eax => x
            */
  return x;
}

void print(short v_as)
{
  printf("\tat 10: %d,\tat 16: %s%x\n", v_as, v_as < 0 ? "-": "", v_as < 0 ? -(unsigned)v_as : v_as );
}

void solve(char x, short y, char z, short v)
{
  short v_c = (7 * (z + 7) - y) / (3 * x - 1) + 2;
  short v_as = assembler(x, y, z);
  printf("\n<<Assembler>>"); print(v_as);
  printf("<<True answer>>"); print(v);
  printf("<<C>>\t"); print(v_c);
}

int main()
{
  solve(0x1, 0x1, -0x8, -0x2);
  solve(-0x6B, -0x3CF4, 0x74, -0x31);
  return 0;
}