Q: Solve:
Solve -69 = -42*l - 65 - 172 for l.

A: -4

Q: Solve:
Solve -30*k + 57*k - 360 = 87*k for k.

A: -6

Q: Solve:
Solve -950 = 190*k - 150*k + 210 for k.

A:
-29