Question:
Solve -62 - 18 = -16*t for t..

Answer:
5

Question:
Solve 28 = -238*w + 231*w for w..

Answer:
-4

Question:
Solve -977*w + 341*w = 475*w + 22220 for w..

Answer:
-20

Question:
Solve -78 = 5*f + 21*f for f..

Answer:
-3