question: Teacher asked me this: Solve -16 = -10*a + 6*a for a.
++++++++++
answer: 4

question: Teacher asked me this: Solve 306*r + 1746 + 2271 = 345 for r.
++++++++++
answer: -12

question: Teacher asked me this: Solve 64*r = 61*r + 9 for r.
++++++++++
answer: 3

question: Teacher asked me this: Solve -4 + 22 = -6*y for y.
++++++++++
answer:
-3