Write down the solution for this math problem: Solve -876*u + 21 = -897*u for u.
answer: -1

Write down the solution for this math problem: Solve 0 = -2290*d + 2243*d + 987 for d.
answer: 21

Write down the solution for this math problem: Solve 2*y - 180 = 20*y for y.
answer: -10

Write down the solution for this math problem: Solve -328*f + 2*f - 2675 = 1563 for f.
answer:
-13