question: Teacher asked me this: Solve 80*a = 71*a - 36 for a.
++++++++++
answer: -4

question: Teacher asked me this: Solve -73 = 41*u + 32*u for u.
++++++++++
answer: -1

question: Teacher asked me this: Solve -15*x + 13 + 17 = 0 for x.
++++++++++
answer: 2

question: Teacher asked me this: Solve -113*k = -10*k + 927 for k.
++++++++++
answer:
-9