Q: Solve:
Solve -6*z + 108 = 7*z - 4*z for z.

A: 12

Q: Solve:
Solve -893 = 330*d - 305*d + 57 for d.

A: -38

Q: Solve:
Solve 33*a = -100*a + 4934 - 1077 for a.

A:
29