Write down the solution for this math problem: Solve -8 = -7*n + 9*n for n.
answer: -4

Write down the solution for this math problem: Solve -13922*l + 13993*l = -639 for l.
answer: -9

Write down the solution for this math problem: Solve -165*u = -2118 - 1182 for u.
answer: 20

Write down the solution for this math problem: Solve 0 = 30*s - 37*s + 63 for s.
answer:
9