Solve 0 = 3*r - 4*z - 28, -5*r = 10*z - 5*z for r.

4

Solve -5*k = -9*r + 5*r - 25, -2*k + 5*r + 10 = 0 for k.

5

Solve -2*r - 13 = m, -253*r - 5*m - 25 = -251*r for r.

-5

Solve 4*n - 4 - 19 = 3*o, 0 = -n + 4*o + 22 for n.

2

Solve -3 = -3*r, -3*v + r = -3*r - 11 for v.

5

Solve 4 = 4*o - 2*i, 0*o = o + 4*i - 10 for o.

2

Solve 5*v - 40 = 5*f - 50, 3*v + 13 = -4*f for f.

-1

Solve 4*o + 4*s + 12 = 0, 3*s + 5 = -2*o - 4 for o.

0

Solve q = 2*v - 24 + 38, -v = -q + 9 for v.

-5

Solve 3*t + 2*b - 5 = 10, -4*b = 5*t - 27 for t.

3