Solve 4*o - 20 = -2*x, -2*x - 30 = -3*o - 15 for x.

0

Solve 10*h - 7*h - 5*g + 31 = 0, 0 = -5*g + 25 for h.

-2

Solve h = -4*v, 8*v - 9 = -h + 13*v for h.

4

Solve 0 = -4*d + 3*z + 14, 45*d - 13 = 42*d + z for d.

5

Solve 13*y - 12*y + 2*f + 8 = 0, 5*y = f + 15 for y.

2

Solve -10 = 5*y, 4*m - 20 = 5*y - y for m.

3

Solve -2*z = -50*i + 48*i, -i - 2 = 0 for z.

-2

Solve -2*t - 20 = 3*t, -5*i + t + 24 = 0 for i.

4

Solve 5*i = -10 - 15, -i - 20 = -3*n for n.

5

Solve -7*j + 4 = -5*j, -2*j = 2*k for k.

-2