Write down the solution for this math problem: Solve -193861 + 41633 = 6625*u + 180633 + 91139 for u.
answer: -64

Write down the solution for this math problem: Solve -7*r + 23*r + 48 = 0 for r.
answer: -3

Write down the solution for this math problem: Solve 0 = -2*d + 13 - 9 for d.
answer: 2

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