question: Teacher asked me this: Solve -253*b = -257*b - 84 for b.
++++++++++
answer: -21

question: Teacher asked me this: Solve 7*a - 767 + 760 = 0 for a.
++++++++++
answer: 1

question: Teacher asked me this: Solve -12 = -15*x + 4*x + 109 for x.
++++++++++
answer: 11

question: Teacher asked me this: Solve 0*p - 13414 = -341*p - 12*p for p.
++++++++++
answer:
38