Question:
Solve -66 = -14*u + 36*u for u..

Answer:
-3

Question:
Solve 17 = x + 6*x + 38 for x..

Answer:
-3

Question:
Solve 9 - 82 = 129*r + 1346 for r..

Answer:
-11

Question:
Solve -350*t + 37*t + 13156 = -60*t for t..

Answer:
52