question: Teacher asked me this: Solve 7*y + 12*y - 81 = -8*y for y.
++++++++++
answer: 3

question: Teacher asked me this: Solve -72374*a = -71176*a - 56306 for a.
++++++++++
answer: 47

question: Teacher asked me this: Solve 120 + 27 = -21*n for n.
++++++++++
answer: -7

question: Teacher asked me this: Solve 0 = -7*o + 10*o - 14*o for o.
++++++++++
answer:
0