Problem: Math Problem
Solve 15*r = 120*r - 351 - 1644 for r.

A: 19

Problem: Math Problem
Solve 25 = 11*r + 14*r for r.

A: 1

Problem: Math Problem
Solve -78*s + 1044 + 415 - 549 = -1352 for s.

A:
29