Solve -5*k = 0, k = 186*c - 189*c + 21 for c.

7

Solve 3*n + 0*n = 4*o + 21, 0 = 5*n + 5*o for n.

3

Solve 0 = -l + 1, -3*l = 2*z - 2 - 9 for z.

4

Solve 9*r + 16 = 5*r + 5*q, 20 = -5*r - 7*q for r.

-4

Solve -3*m + 12 = 0, 24 = 3*d + 33*m - 30*m for d.

4

Solve -2*t - t - 5*r = 18, 0 = -4*t - r - 7 for t.

-1

Solve -69 = -2*b + 2*n - 57, 5*b + 5*n + 10 = 0 for b.

2

Solve 12 = -143*f + 145*f - 2*u, -3*f + u + 12 = 0 for f.

3

Solve 4*z + 20 = 3*t, 0 = -133*t + 130*t - 4*z + 4 for t.

4

Solve 51*g = -4*u + 54*g - 7, 2*g = 3*u + 6 for u.

-4