Question:
Solve 64*s = 54*s + 40 for s..

Answer:
4

Question:
Solve -429*t + 24660 = -6368*t - 5035 for t..

Answer:
-5

Question:
Solve -56 = -30*n + 16*n for n..

Answer:
4

Question:
Solve 175 = 2617*r - 2642*r for r..

Answer:
-7