Question:
Solve 915*o = 919*o + 36 for o..

Answer:
-9

Question:
Solve 0 = 37*r - 100 - 122 for r..

Answer:
6

Question:
Solve 0 = -86*w + 72*w - 168 for w..

Answer:
-12

Question:
Solve -7*j - 25 = -2*j for j..

Answer:
-5