Question:
Solve 0 = 3*r + 58 - 70 for r..

Answer:
4

Question:
Solve -3*i + 40 = 5*i for i..

Answer:
5

Question:
Solve -285 = 288*d + 41*d - 40*d - 1152 for d..

Answer:
3

Question:
Solve -30*c - 3 = -29*c for c..

Answer:
-3