question: Teacher asked me this: Solve -456*r + 217*r + 608*r - 12915 = 0 for r.
++++++++++
answer: 35

question: Teacher asked me this: Solve -48*u - 12*u = 60 for u.
++++++++++
answer: -1

question: Teacher asked me this: Solve 299*a - 325*a = -416 for a.
++++++++++
answer: 16

question: Teacher asked me this: Solve 505*a = 19819 + 5569 - 1653 for a.
++++++++++
answer:
47