Question:
Solve 203 + 254 = -33*y - 1688 for y..

Answer:
-65

Question:
Solve -640*b = -679*b - 390 for b..

Answer:
-10

Question:
Solve -11*d + 5*d = -12 for d..

Answer:
2

Question:
Solve 31 = -5*c + 51 for c..

Answer:
4