Solve 31 = 5*s + 4*c - 12, 33 = 5*s - c for s.

7

Solve 4*z + 12 = -2*a, 6*a + 14 = -5*z + 4*a for z.

-2

Solve -r = f + 4, 390*f - 4 = 393*f - 5*r for f.

-3

Solve 5*u - 3*m + 4 = 0, 0 = 2*m - 19 + 23 for u.

-2

Solve 2*y + 5*a = 5, -2*a - 15 = -2*y + 3*a for y.

5

Solve 4*l + 4*i - 16 = 0, 2*i - 6*i - 11 = -5*l for l.

3

Solve -5 - 17 = 3*q - 5*y, y = 2 for q.

-4

Solve 29 = 2*v + 5*f, 2*v + 0*f + 16 = 4*f for v.

2

Solve -4 + 12 = -c - 3*l, -4*l - 13 = -c for c.

1

Solve -4*u = 5*w - 16, -4*w - 12 = -24*u + 21*u for u.

4