question: Teacher asked me this: Solve -7*t - 13*t + 20 = 0 for t.
++++++++++
answer: 1

question: Teacher asked me this: Solve -305*l + 3149 = 66*l - 1303 for l.
++++++++++
answer: 12

question: Teacher asked me this: Solve 79 = -x + 82 for x.
++++++++++
answer: 3

question: Teacher asked me this: Solve 2*r + 2 = 12 for r.
++++++++++
answer:
5