question: Teacher asked me this: Solve 211*z + 146*z - 129*z + 456 = 0 for z.
++++++++++
answer: -2

question: Teacher asked me this: Solve -2*r = -8*r + 30 for r.
++++++++++
answer: 5

question: Teacher asked me this: Solve 38*m - 400675146 = -400673018 for m.
++++++++++
answer: 56

question: Teacher asked me this: Solve 377 = -90*x + 465*x + 2 for x.
++++++++++
answer:
1