question: Teacher asked me this: Solve -115*v = 109*v - 83*v + 3243 for v.
++++++++++
answer: -23

question: Teacher asked me this: Solve 353*k - 4142 = 87*k + 646 for k.
++++++++++
answer: 18

question: Teacher asked me this: Solve -17*f + 31*f = 0 for f.
++++++++++
answer: 0

question: Teacher asked me this: Solve 331*h - 329*h = 4 for h.
++++++++++
answer:
2