Solve 7559*i = 7449*i - 4840 for i.
Solve this plz.

A: -44

Solve -15*r - 3 = 11 + 16 for r.
Solve this plz.

A: -2

Solve -63563 - 59097 - 133948 = -3564*b for b.
Solve this plz.

A:
72