Q: Solve:
Solve 138 = 7*l + 16*l for l.

A: 6

Q: Solve:
Solve 0 = 15*k - 20*k - 10 for k.

A: -2

Q: Solve:
Solve 720*p + 658*p + 11112 + 10217 + 20011 = 0 for p.

A:
-30