Question:
Solve -15121 = -5*y - 15111 for y..

Answer:
2

Question:
Solve -103*i - 2481 - 1693 = -981 for i..

Answer:
-31

Question:
Solve 128 = 13*b - 171 for b..

Answer:
23

Question:
Solve 665479 = 161*y + 670792 for y..

Answer:
-33