Q: Solve -19 = -7*v - 47 for v.

A: -4

Q: Solve -26 = 5*u - 41 for u.

A: 3

Q: Solve -20 + 27 = -10*k + 27 for k.

A: 2

Q: Solve -509*f + 462*f - 564 = 0 for f.

A:
-12