Write down the solution for this math problem: Solve 28*u = 30*u + 8 for u.
answer: -4

Write down the solution for this math problem: Solve -8081*l - 25551 - 95664 = 0 for l.
answer: -15

Write down the solution for this math problem: Solve 230*q + 323 = 6533 for q.
answer: 27

Write down the solution for this math problem: Solve 513*t + 697*t + 20177 - 2027 = 0 for t.
answer:
-15