question: Teacher asked me this: Solve 56 = -10*r - 4*r for r.
++++++++++
answer: -4

question: Teacher asked me this: Solve -10 = -b + 6*b for b.
++++++++++
answer: -2

question: Teacher asked me this: Solve 2 = 3*v - 7 for v.
++++++++++
answer: 3

question: Teacher asked me this: Solve 28*d + 112 = 12*d for d.
++++++++++
answer:
-7