Solve -210 - 6 = -72*i for i.
Solve this plz.

A: 3

Solve 7083*m - 7722 = 6940*m for m.
Solve this plz.

A: 54

Solve -703418*r = -703522*r - 2454 + 374 for r.
Solve this plz.

A:
-20