Solve 23*a + 203*a + 9900 = -49*a for a.
Solve this plz.

A: -36

Solve 8*o = -2 + 26 for o.
Solve this plz.

A: 3

Solve -15*r - 7*r - 7*r - 12*r = -820 for r.
Solve this plz.

A:
20