Solve -3*b + 5*a - 21 = 0, -2*a = b + 15 - 19 for b.

-2

Solve 0 = d + d - v + 11, 0 = -d - 3*v + 12 for d.

-3

Solve 0*g = 2*g - 3*x + 17, -5 = -5*g - 2*x for g.

-1

Solve -3*v - 3 = -3*g, -v - 11 = 5*g + 2 for v.

-3

Solve 0 = 4*l + 3*m + 3, -l - 2*m = -23 + 20 for l.

-3

Solve 6 = -0*u - 3*u - 2*s, -u = -5*s + 19 for u.

-4

Solve 4*k - v = 8, 5*k + 4*v + 0*v - 31 = 0 for k.

3

Solve 0 = 3*h - 0*r - 4*r + 11, -5*h = 3*r - 1 for h.

-1

Solve -81*s + 4*b - 6 = -80*s, 0 = s - b for s.

2

Solve 2*o + o + 12 = -3*f, -8 = -4*o + 2*f for o.

0