Solve -2440*t + 6823 = -5337 - 40 for t.
Solve this plz.

A: 5

Solve -4*n + 91 = -90 + 177 for n.
Solve this plz.

A: 1

Solve -17*c - 20 = -42*c + 15*c for c.
Solve this plz.

A:
2