Solve a + t + 3 = 0, -19*t = -20*t - 1 for a.

Solve 5*y + 25 = -7*w + 12*w, -w + 9 = -3*y for w.

3

Solve 5*v - 5*s = -15, -5*v - 9*s + 5*s + 57 = 0 for v.

5

Solve -5*k + 20 = 4*v - 12, -7*v + 13 = -2*k for v.

3

Solve -3*u - 19 = -5*t, -2*u - 4 = -4*t + 10 for t.

2

Solve 2*v - 4*v - 7 = -n, 3*v = 3*n - 6 for n.

-3

Solve -20 = -4*j, 4*f + 50 = 5*j + 9 for f.

-4

Solve 12*y - 20 = 7*y + 4*s, 0 = 3*y + 2*s - 12 for y.

4

Solve -53*h = -5*q - 54*h - 8, 0 = 5*q - 2*h + 14 for q.

-2

Solve -4*f = 12, 0 = -4*s + 4*f - 7*f - 17 for s.

-2

Solve 3*o - 18 = -5*s, -o - 19 - 3 = -3*s for s.

6