Solve -d = 3*l - 15, 0 = -9*l - 0*l + 5*d + 21 for l.

4

Solve -c + 2*l - 4 = -0, 2*c - 2*l = -4 for c.

0

Solve z = -5*b + 5, -4*z + 30*b - 18 = 31*b for z.

-5

Solve 5*r = -4*f + 20, 4*r + 6*f = 11*f + 16 for r.

4

Solve -3*u + 4*k = u - 8, 4*u - 24 = -4*k for u.

4

Solve -4*n - 3*m = 21, -3*n + 2*m + 0 = 3 for n.

-3

Solve -5*x = 3*y - 30, 6*y - 4*y = 10 for x.

3

Solve 0*s - 4*s = a + 7, 0 = a - 5*s - 2 for a.

-3

Solve -5*m - 2*z + 0 + 3 = 0, -4*m = 4*z for m.

1

Solve -54*f + 31 = -50*f - 5*d, 2*f - d - 11 = 0 for f.

4