Solve r - 4 = 5*o, -3*o - 16 = -o - 4*r for o.

0

Solve -7*v = -3*l - 12*v - 10, 3*v + 6 = l for l.

0

Solve 0*z - a + 4 = 4*z, -a = -z - 4 for z.

0

Solve -5*s - 15 = 0, 18 - 21 = 3*j - 2*s for j.

-3

Solve v + 9 = 3*i, 3*i + 0*v = -v + 3 for i.

2

Solve -7*i = -2*i - 2*d - 8, -5*i + 3*d + 12 = 0 for i.

0

Solve -18 = -0*j + j + 3*a, -5*a = -5*j + 10 for j.

-3

Solve -4 = v + 2*s, -5*v - 880*s + 877*s + 1 = 0 for v.

2

Solve -4*n - 2 = 2*q, 2*n - 4*q - 4 = n for n.

0

Solve -3*x = -2*g + 12 - 7, 0 = 5*x + 5*g for x.

-1