question: Teacher asked me this: Solve 4*i + 523 = 487 for i.
++++++++++
answer: -9

question: Teacher asked me this: Solve -18*a = -14*a + 16 for a.
++++++++++
answer: -4

question: Teacher asked me this: Solve -19*n + 112 = -3*n + 40*n for n.
++++++++++
answer: 2

question: Teacher asked me this: Solve -22*r = 512 - 468 for r.
++++++++++
answer:
-2