Solve -169 = -12945*u + 12958*u for u.
Solve this plz.

A: -13

Solve -6*l + 12*l + 24 = 0 for l.
Solve this plz.

A: -4

Solve 746*b + 9476 = 168*b - 3818 for b.
Solve this plz.

A:
-23