Write down the solution for this math problem: Solve -30*k = 77879 - 80009 for k.
answer: 71

Write down the solution for this math problem: Solve -4*j = 6*j + 197 + 23 for j.
answer: -22

Write down the solution for this math problem: Solve 44307 + 5097 = 716*c for c.
answer: 69

Write down the solution for this math problem: Solve 160*s - 1550 = 680*s - 11950 for s.
answer:
20