question: Teacher asked me this: Solve -7968*z = -7958*z - 250 for z.
++++++++++
answer: 25

question: Teacher asked me this: Solve 21*r - 19*r + 182 = -12*r for r.
++++++++++
answer: -13

question: Teacher asked me this: Solve -14*c + 17 = 59 for c.
++++++++++
answer: -3

question: Teacher asked me this: Solve 0 = -19*l - 26 + 7 for l.
++++++++++
answer:
-1