Question:
Solve -3 - 33 = -6*r for r..

Answer:
6

Question:
Solve 118*o + 57*o = 117 + 933 for o..

Answer:
6

Question:
Solve 11*l + 950 = 961 for l..

Answer:
1

Question:
Solve a = 200 - 201 for a..

Answer:
-1