question: Teacher asked me this: Solve 19*z = 12*z - 21 for z.
++++++++++
answer: -3

question: Teacher asked me this: Solve -529*o + 1089*o + 760 = 520*o for o.
++++++++++
answer: -19

question: Teacher asked me this: Solve -897*g = -894*g + 15 for g.
++++++++++
answer: -5

question: Teacher asked me this: Solve 11480*k - 66659 - 242822 = -68401 for k.
++++++++++
answer:
21