Question:
Solve -10*u + 8*u = -4 for u..

Answer:
2

Question:
Solve -74*y + 54 = -263*y + 54 for y..

Answer:
0

Question:
Solve -113 = -9*c - 113 for c..

Answer:
0

Question:
Solve 231*r = 127*r + 574 + 1104 + 4562 for r..

Answer:
60