Write down the solution for this math problem: Solve 105*r - 1206 = -11*r - 18*r for r.
answer: 9

Write down the solution for this math problem: Solve -16*l = 1147 - 1035 for l.
answer: -7

Write down the solution for this math problem: Solve 380*o = 378*o - 4 for o.
answer: -2

Write down the solution for this math problem: Solve -17*o + 93 + 67 = -61 for o.
answer:
13