Question:
Solve -20 - 13 = 11*o for o..

Answer:
-3

Question:
Solve -k + 6 = k for k..

Answer:
3

Question:
Solve 12 = 94*s - 90*s for s..

Answer:
3

Question:
Solve -42*g = 29*g + 568 for g..

Answer:
-8