question: Teacher asked me this: Solve -18*r + 27*r + 45 - 180 = 0 for r.
++++++++++
answer: 15

question: Teacher asked me this: Solve -141*u - 463 + 236 = 478 for u.
++++++++++
answer: -5

question: Teacher asked me this: Solve 848 = 148*a + 2506 + 2338 for a.
++++++++++
answer: -27

question: Teacher asked me this: Solve -2*q - 9 = -5 for q.
++++++++++
answer:
-2