Solve 5*r - 13 = r - f, 2*r - f = 5 for r.

3

Solve 0 = 2*t + 2*f - 4, -2*t + 7*t + 3*f - 8 = 0 for t.

1

Solve 5*r - 2*r - 15 = -4*p, 5*r = 4*p + 25 for p.

0

Solve -2*w - 6 = 2*s, s = -w + 5*w - 3 for w.

0

Solve -20*k - 11 = -c - 18*k, -9 = -3*c - 2*k for c.

5

Solve 1 = -r, -q + 5*r = 1 - 8 for q.

2

Solve 3*w = -r + 2, 0 = -0*r - r + w - 2 for r.

-1

Solve -b + 5*c + 0*c - 12 = 0, 0 = -5*c + 15 for b.

3

Solve a = -4*b + 19, 5*a = -435*b + 432*b + 10 for b.

5

Solve -4*a + 6*a - 4*q = -12, -4*q + 20 = -4*a for a.

-4