question: Teacher asked me this: Solve -12 = 4*n - n for n.
++++++++++
answer: -4

question: Teacher asked me this: Solve -62*k = -63*k + 2 for k.
++++++++++
answer: 2

question: Teacher asked me this: Solve 107*z - 38*z + 609 = 40*z for z.
++++++++++
answer: -21

question: Teacher asked me this: Solve -74*x + 6249 - 10097 = 0 for x.
++++++++++
answer:
-52