Write down the solution for this math problem: Solve 31 = -4*r + 47 for r.
answer: 4

Write down the solution for this math problem: Solve 953 + 5690 = 548*b + 67 for b.
answer: 12

Write down the solution for this math problem: Solve -126 = 5*j - 156 for j.
answer: 6

Write down the solution for this math problem: Solve 191*n - 1543*n = -4056 for n.
answer:
3