Write down the solution for this math problem: Solve 41*n + 18 = 262 + 84 for n.
answer: 8

Write down the solution for this math problem: Solve 100320 = 97561*r - 96421*r for r.
answer: 88

Write down the solution for this math problem: Solve 472*a - 5405 = -152*a + 8947 for a.
answer: 23

Write down the solution for this math problem: Solve -107 = 27*i - 512 for i.
answer:
15