Write down the solution for this math problem: Solve -638*c - 40 = -646*c for c.
answer: 5

Write down the solution for this math problem: Solve -23*y + 52*y + 145 = 0 for y.
answer: -5

Write down the solution for this math problem: Solve 14*r + 54 = -30 for r.
answer: -6

Write down the solution for this math problem: Solve 704183*c - 702683*c = -180000 for c.
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
-120