question: Teacher asked me this: Solve 343*k - 331*k + 72 = 0 for k.
++++++++++
answer: -6

question: Teacher asked me this: Solve -316*c + 3180 = 79*c + 135*c for c.
++++++++++
answer: 6

question: Teacher asked me this: Solve 0 = 178*r - 175*r + 12 for r.
++++++++++
answer: -4

question: Teacher asked me this: Solve -1965 + 0 = 290*l + 645 for l.
++++++++++
answer:
-9