Q: What is the solution?
Solve -26*l - l + 138 - 3 = 0 for l.

A: 5

Q: What is the solution?
Solve 5*a + 257 = -20*a + 782 for a.

A: 21

Q: What is the solution?
Solve 0 = 17*f - 8039 + 7818 for f.

A:
13