Q: Solve 10*c = 4*c - 12 for c.

A: -2

Q: Solve 0 = 10*r - 14*r - 4 for r.

A: -1

Q: Solve 3973*p = 4158*p + 3145 for p.

A: -17

Q: Solve -68*k = -97*k + 116 for k.

A:
4