Solve 0 = 2*r - 4*a + 28 - 10, 0 = 3*r - 4*a + 23 for r.

-5

Solve 18 = s + 5*o, -6*s + 9*o - 14*o + 33 = 0 for s.

3

Solve -u + 2*d = 3*u + 12, 2*d - 6 = u for u.

-2

Solve -5*b - d = 20 - 35, -4*d = -20 for b.

2

Solve -5*y + 2*u - 7*u = 0, -3*y = 5*u + 10 for y.

5

Solve f + 15 = 5*i, 25*i - 20*i = 4*f for f.

5

Solve -5*n + 5*v = 10, 0 = -4*n + 2*v - 15 - 1 for n.

-6

Solve 3*u = 4*r + 30 - 20, -2*r - 6 = -2*u for u.

2

Solve l + 1 = 5*d + 15, -5*l + 10 = 5*d for l.

4

Solve 2*m - 2 = -2*f, f + 0 + 3 = m for m.

2