question: Teacher asked me this: Solve v - 17 = -18 for v.
++++++++++
answer: -1

question: Teacher asked me this: Solve 157*s - 379 = 1034 for s.
++++++++++
answer: 9

question: Teacher asked me this: Solve -k + 5*k = -3*k for k.
++++++++++
answer: 0

question: Teacher asked me this: Solve 243 = 40*x - 157 for x.
++++++++++
answer:
10