Solve -3*b - 4 = -7 for b.
Solve this plz.

A: 1

Solve -55*t - 157 = -85*t + 503 for t.
Solve this plz.

A: 22

Solve -408*d + 412*d + 4 = 0 for d.
Solve this plz.

A:
-1