question: Teacher asked me this: Solve 30 = 21*r - 103 + 49 for r.
++++++++++
answer: 4

question: Teacher asked me this: Solve -24*b + 34*b - 5521 = -82*b - 1105 for b.
++++++++++
answer: 48

question: Teacher asked me this: Solve -7030 = -98*r + 54*r - 141*r for r.
++++++++++
answer: 38

question: Teacher asked me this: Solve -20*n + 40 = -12*n for n.
++++++++++
answer:
5