Question:
Solve 389*r = 226*r + 1956 for r..

Answer:
12

Question:
Solve 100*n - 136 = 52*n + 52*n for n..

Answer:
-34

Question:
Solve 354*u - 356*u = -8 for u..

Answer:
4

Question:
Solve 0 = 48*r + 52 - 148 for r..

Answer:
2