Question:
Solve -7*u - 230 = -53*u for u..

Answer:
5

Question:
Solve 1530 = -60*r + 242*r - 2292 for r..

Answer:
21

Question:
Solve 122*s = -18*s - 980 for s..

Answer:
-7

Question:
Solve -17108 = 854*u + 3388 for u..

Answer:
-24