Write down the solution for this math problem: Solve 2841*c = 2825*c + 80 for c.
answer: 5

Write down the solution for this math problem: Solve -6877*x + 64468 - 103925 - 305242 = 143568 for x.
answer: -71

Write down the solution for this math problem: Solve -12*a + 18 = -9*a for a.
answer: 6

Write down the solution for this math problem: Solve -6*d + 397 = 331 for d.
answer:
11