Write down the solution for this math problem: Solve 51*t - 36*t = -60 for t.
answer: -4

Write down the solution for this math problem: Solve -k = 3*k - 2*k for k.
answer: 0

Write down the solution for this math problem: Solve -4 = 781*x - 782*x for x.
answer: 4

Write down the solution for this math problem: Solve -235*a - 708 + 1357 + 1721 = -77*a for a.
answer:
15