Write down the solution for this math problem: Solve 2*k - 22 = 13*k for k.
answer: -2

Write down the solution for this math problem: Solve 39*d = 306*d + 5280 - 1275 for d.
answer: -15

Write down the solution for this math problem: Solve 0 = -6*d + 2 + 22 for d.
answer: 4

Write down the solution for this math problem: Solve 0 = -355*r - 1570 + 9735 for r.
answer:
23