Write down the solution for this math problem: Solve -2537*a - 1717 = -1259*a - 1379*a for a.
answer: 17

Write down the solution for this math problem: Solve 0 = 7*y + 3*y + 20 for y.
answer: -2

Write down the solution for this math problem: Solve 0 = 87*s - 49*s - 228 for s.
answer: 6

Write down the solution for this math problem: Solve -10*u - 4373 + 4523 = 0 for u.
answer:
15