question: Teacher asked me this: Solve 5*b + 61 - 86 = 0 for b.
++++++++++
answer: 5

question: Teacher asked me this: Solve 21*v - 37*v - 48 = 0 for v.
++++++++++
answer: -3

question: Teacher asked me this: Solve -21 + 17 = -14*x + 24 for x.
++++++++++
answer: 2

question: Teacher asked me this: Solve 30*j = 21*j + 18 for j.
++++++++++
answer:
2