Solve 49 = 48*r - 47 for r.
Solve this plz.

A: 2

Solve 351*a = 125*a + 3616 for a.
Solve this plz.

A: 16

Solve -237*s + 0*s - 4823 = 134*s for s.
Solve this plz.

A:
-13