Q: What is the solution?
Solve 0 = -21*l - 14 - 7 for l.

A: -1

Q: What is the solution?
Solve 538*f + 388*f + 1749 = 343*f for f.

A: -3

Q: What is the solution?
Solve 10*q = -0*q + 10 for q.

A:
1