Question:
Solve -5*u - 265 = -315 for u..

Answer:
10

Question:
Solve 43 - 45 = -r for r..

Answer:
2

Question:
Solve -168*n - 262*n = -5590 for n..

Answer:
13

Question:
Solve -66*t + 283 = 39*t + 73 for t..

Answer:
2