Q: Solve:
Solve 1643*n = 581*n - 61*n - 2034*n + 59983 for n.

A: 19

Q: Solve:
Solve 9091*r - 179765 = 228144 + 255734 for r.

A: 73

Q: Solve:
Solve 765*d - 15621 = -410*d - 3871 for d.

A:
10