Q: Solve:
Solve -42*a - 128*a + 3511 = -1223*a + 77221 for a.

A: 70

Q: Solve:
Solve -1992*j + 530031 = -10528*j + 128839 for j.

A: -47

Q: Solve:
Solve 13*d - 20 = 8*d for d.

A:
4