Q: What is the solution?
Solve 4 = -158*a + 157*a for a.

A: -4

Q: What is the solution?
Solve 0 = 5515*k - 1117*k + 3385*k - 474763 for k.

A: 61

Q: What is the solution?
Solve 42 = -10*b + 32 for b.

A:
-1