Q: Solve -10*h = -7*h + 12 for h.

A: -4

Q: Solve 653*a - 64 = 645*a for a.

A: 8

Q: Solve -109*d - 777 = 967 for d.

A: -16

Q: Solve 1531*z = -912*z - 2352*z + 271961 - 665151 for z.

A:
-82