Write down the solution for this math problem: Solve -573*x + 16425 + 6587 = 1238 for x.
answer: 38

Write down the solution for this math problem: Solve -827*a = -832*a - 20 for a.
answer: -4

Write down the solution for this math problem: Solve a + 45 = 6*a for a.
answer: 9

Write down the solution for this math problem: Solve 3978*r = 4050*r - 6984 for r.
answer:
97