Question:
Solve -2*o - 11 + 91 + 0 = 0 for o..

Answer:
40

Question:
Solve 100 = -0*w - 20*w for w..

Answer:
-5

Question:
Solve 8*u - 6*u + 4 = 0 for u..

Answer:
-2

Question:
Solve -169*t + 173*t - 38 = -14 for t..

Answer:
6