question: Teacher asked me this: Solve 0 = -6391*k + 6297*k + 282 for k.
++++++++++
answer: 3

question: Teacher asked me this: Solve 247*r - 68 = -1823 - 1209 for r.
++++++++++
answer: -12

question: Teacher asked me this: Solve 3*z + 141*z - 61360 = -298*z - 78*z for z.
++++++++++
answer: 118

question: Teacher asked me this: Solve 12339 = -1271*b + 1728*b for b.
++++++++++
answer:
27