Solve 304*d = -258*d - 2886 - 6106 for d.
Solve this plz.

A: -16

Solve 117 + 401 = 74*b for b.
Solve this plz.

A: 7

Solve 9*a + 0*a - 311 + 1442 = -20*a for a.
Solve this plz.

A:
-39