question: Teacher asked me this: Solve -2*z = 102 - 90 for z.
++++++++++
answer: -6

question: Teacher asked me this: Solve -3 - 32 = -5*k for k.
++++++++++
answer: 7

question: Teacher asked me this: Solve -1593*r - 75082 = 101563 - 44426 for r.
++++++++++
answer: -83

question: Teacher asked me this: Solve 0 = 109*z + 2606 - 4786 for z.
++++++++++
answer:
20