Solve 1972 = 181*l - 743 for l.
Solve this plz.

A: 15

Solve 83*t = 294*t + 813 + 1930 for t.
Solve this plz.

A: -13

Solve 0 = -89*r - 5042 + 6644 for r.
Solve this plz.

A:
18