Q: What is the solution?
Solve 8*d + 137 - 81 = 0 for d.

A: -7

Q: What is the solution?
Solve 0 = 3*b + 2*b + 2*b for b.

A: 0

Q: What is the solution?
Solve 133*b + 66*b - 21*b = 19*b for b.

A:
0