question: Teacher asked me this: Solve 54*x = 3*x + 153 for x.
++++++++++
answer: 3

question: Teacher asked me this: Solve 66*f - 542 - 1714 = -75*f for f.
++++++++++
answer: 16

question: Teacher asked me this: Solve -224*u - 263*u + 545*u - 1392 = 0 for u.
++++++++++
answer: 24

question: Teacher asked me this: Solve -21 = 105*u + 113*u + 162*u + 1499 for u.
++++++++++
answer:
-4