Question:
Solve -286*u + 251*u - 140 = 0 for u..

Answer:
-4

Question:
Solve -5*t - 13 - 7 = 0 for t..

Answer:
-4

Question:
Solve 0 = 562397*t - 562342*t + 715 for t..

Answer:
-13

Question:
Solve v = 14*v - 65 for v..

Answer:
5