Solve 54*r - 40*r = 84 for r.

6

Solve 0 = 13*k - 8*k - 20 for k.

4

Solve 15 = z + 10 for z.

5

Solve -18*f + 35 + 19 = 0 for f.

3

Solve 44 = -13*j + 2*j for j.

-4

Solve -4*y - 7 = 13 for y.

-5

Solve -28 + 3 = 5*q for q.

-5

Solve 10*f = f - 4*f for f.

0

Solve 4*t = 7*t + 7*t for t.

0

Solve 0 = -4*p + 25 - 9 for p.

4