Question:
Solve 552*a - 189*a + 924 = 286*a for a..

Answer:
-12

Question:
Solve 8 = -o + 3*o for o..

Answer:
4

Question:
Solve -667*b = -587*b + 80 for b..

Answer:
-1

Question:
Solve -9 - 15 = 5*s + s for s..

Answer:
-4