Question: What is the solution?

Solve 161 = 30700*r - 30677*r for r.

Answer: 7

Question: What is the solution?

Solve 561*o = 566*o - 150 for o.

Answer: 30

Question: What is the solution?

Solve 365*b - 689*b = -335*b + 561 for b.

Answer: 51

Question: What is the solution?

Solve -111*t + 1735 - 1699 - 3810 = 0 for t.

Answer:
-34