Write down the solution for this math problem: Solve -62*n + 69*n = -28 for n.
answer: -4

Write down the solution for this math problem: Solve 7*u - 25 - 50 = -26 for u.
answer: 7

Write down the solution for this math problem: Solve 10410*d + 7503*d + 304970 = -12584*d for d.
answer: -10

Write down the solution for this math problem: Solve -3298 + 3307 = v for v.
answer:
9