Solve -55*i + 159 = 28*i - 5*i - 2103 for i.
Solve this plz.

A: 29

Solve -1669 = 4*i - 1609 for i.
Solve this plz.

A: -15

Solve -2977 = -265*a - 4889 - 6751 - 1142 for a.
Solve this plz.

A:
-37