Question: What is the solution?

Solve 16 = 9*r - 11 for r.

Answer: 3

Question: What is the solution?

Solve -2697*b + 5 + 4 = -2706*b for b.

Answer: -1

Question: What is the solution?

Solve 34*t - 21*t = 0 for t.

Answer: 0

Question: What is the solution?

Solve 2 - 191 = -63*z for z.

Answer:
3