Solve 169*b - 233*b + 4 = -508 for b.
Solve this plz.

A: 8

Solve -269*a + 543*a - 61 = 270*a + 147 for a.
Solve this plz.

A: 52

Solve 34*r + 250 = -32*r + 16*r for r.
Solve this plz.

A:
-5