Solve 2*r - 20 = -x - 21, 2 = -2*x + r for x.

-1

Solve -5*a + 4*s - 7 = 0, 5 = 2*a + 3*s - 2*s for a.

1

Solve -27 = x + 4*w + 4, 0 = 2*x + 3*w + 17 for x.

5

Solve 12*g + 2 = -2*u + 10*g, 20 = 5*g for u.

-5

Solve 2*s + 71*k - 69*k - 4 = 0, 5*s + 3*k = 16 for s.

5

Solve -2*y = -t - 1, 0*y = 2*y - 2*t + 4 for y.

3

Solve -3*p = o + 29 - 19, 10 = o - p for o.

5

Solve 4*b = 4*v - 16, 0 = 4*v - 0*b + b - 16 for v.

4

Solve -4*i = -12, 4*f - 4*i - i = -7 for f.

2

Solve 4*s = -20, -4*i - i - 3*s = 10 for i.

1