Write down the solution for this math problem: Solve -20*m - 5 = -19*m for m.
answer: -5

Write down the solution for this math problem: Solve -51316 + 50716 = 30*m for m.
answer: -20

Write down the solution for this math problem: Solve 243*x + 225 = 569*x - 307*x - 1105 for x.
answer: 70

Write down the solution for this math problem: Solve -25818*r + 1 = -25829*r + 1 for r.
answer:
0