question: Teacher asked me this: Solve 22*r = 2*r - 25*r for r.
++++++++++
answer: 0

question: Teacher asked me this: Solve -52*k + 1870 = 1350 for k.
++++++++++
answer: 10

question: Teacher asked me this: Solve 8*f - 12*f = -11*f + 112 for f.
++++++++++
answer: 16

question: Teacher asked me this: Solve 5 = 28*l + 117 for l.
++++++++++
answer:
-4