Solve -2*r - 2*s - 4 = 0, 4*s = 9*r - 7*r + 22 for r.

-5

Solve 4*y - t = 7, 5*y - 2*t + 94 = 99 for y.

3

Solve -3*z + 5 + 8 = 2*s, z - s = 6 for z.

5

Solve -4*u - 2 = 3*s - 3, -u + 13 = 5*s for s.

3

Solve 0 = 2*y - 2*z + 2 + 8, -14 = 4*y - 2*z for y.

-2

Solve 2*i = 4*f + 20, 0*i - i + 5*f = -19 for i.

4

Solve 2 = -c - 2, 4*c = 5*u - 6 for u.

-2

Solve 0*q = -2*s + 4*q - 16, 4*q - 8 = 0 for s.

-4

Solve -6*u + k = -10*u + 15, 0 = 5*u - 2*k - 35 for u.

5

Solve 20 = 4*a + 4*s, 5*a = -15*s + 19*s + 25 for a.

5