Write down the solution for this math problem: Solve -21 + 0 = 25*d + 29 for d.
answer: -2

Write down the solution for this math problem: Solve -48*r - 4*r - 541 + 877 = -496 for r.
answer: 16

Write down the solution for this math problem: Solve 1800 = -11*n + 2075 for n.
answer: 25

Write down the solution for this math problem: Solve -18*t = -16*t + 37*t for t.
answer:
0