question: Teacher asked me this: Solve 15*j = j + 8*j for j.
++++++++++
answer: 0

question: Teacher asked me this: Solve -23*i + 25 = -67 for i.
++++++++++
answer: 4

question: Teacher asked me this: Solve -30*r = -3347 + 2687 for r.
++++++++++
answer: 22

question: Teacher asked me this: Solve 2*f + 97 = 97 for f.
++++++++++
answer:
0