question: Teacher asked me this: Solve -2*p + 9*p + 21 = 0 for p.
++++++++++
answer: -3

question: Teacher asked me this: Solve 5*z - 27 = -42 for z.
++++++++++
answer: -3

question: Teacher asked me this: Solve 143*g + 724*g - 155*g = 14952 for g.
++++++++++
answer: 21

question: Teacher asked me this: Solve 421*f + 2151 + 218 = -157 for f.
++++++++++
answer:
-6