question: Teacher asked me this: Solve 429*f - 680*f + 1004 = 0 for f.
++++++++++
answer: 4

question: Teacher asked me this: Solve -2*u - u = 0 for u.
++++++++++
answer: 0

question: Teacher asked me this: Solve -209480 + 210180 = -28*h for h.
++++++++++
answer: -25

question: Teacher asked me this: Solve -493 = -51*j + 884 for j.
++++++++++
answer:
27