Write down the solution for this math problem: Solve 61*b - 854*b - 32925 = 524*b for b.
answer: -25

Write down the solution for this math problem: Solve -4415*i = -4564*i + 1043 for i.
answer: 7

Write down the solution for this math problem: Solve 10672*u - 10687*u = -240 for u.
answer: 16

Write down the solution for this math problem: Solve 74 - 140 = 2*r - 90 for r.
answer:
12