Question:
Solve 0 = -128721*o + 128741*o - 1980 for o..

Answer:
99

Question:
Solve 164*r = -1949 + 145 for r..

Answer:
-11

Question:
Solve 65 = -4*s + 61 for s..

Answer:
-1

Question:
Solve 17*j - 51 = 51*j - 221 for j..

Answer:
5