question: Teacher asked me this: Solve -6*g - 18 - 18 = 0 for g.
++++++++++
answer: -6

question: Teacher asked me this: Solve z = -2 + 1 for z.
++++++++++
answer: -1

question: Teacher asked me this: Solve 20 = 14*s - 9*s for s.
++++++++++
answer: 4

question: Teacher asked me this: Solve 0 = -5*s - 7*s + 771 - 711 for s.
++++++++++
answer:
5