Solve -4*s + 3*n = -18, 3*s + 21*n - 3 = 18*n for s.

3

Solve 3*i - 7*o + 3*o - 23 = 0, 0 = o + 5 for i.

1

Solve 2*m = -2*u - 0*m + 12, 0 = 2*m - 10 for u.

1

Solve 3*y - 7*z = -11*z + 15, -4*y = -3*z - 20 for y.

5

Solve -5*y = -4*f - 12, 16*f = 18*f + 5*y - 24 for f.

2

Solve 2*m - 1 + 0 = n, -m - 4*n - 4 = 0 for m.

0

Solve 2*d - 8 = 2*i, -77 = 2*d + 4*i - 85 for d.

4

Solve -2*z + 5*b + 31 = 2*z, -4*z + 2*b = -22 for z.

4

Solve -2*d - v = 1 + 2, 6 = -2*v for d.

0

Solve 2*c = 2*z - 10, z = -5*c + c + 5 for c.

0