Q: Solve:
Solve -3*r + 390 = -18*r - 11*r for r.

A: -15

Q: Solve:
Solve 0 = 2782*d + 1403*d - 297*d - 298755 - 257229 for d.

A: 143

Q: Solve:
Solve 0 = 44*n + n - 4*n for n.

A:
0