Question: What is the solution?

Solve 0 = -7*s + 4*s + 12 for s.

Answer: 4

Question: What is the solution?

Solve -5*t - 18 + 3 = 0 for t.

Answer: -3

Question: What is the solution?

Solve 89*r + 5860 - 1930 = -6*r - 36*r for r.

Answer: -30

Question: What is the solution?

Solve 0 = -6*j - 51*j + 136 - 1333 for j.

Answer:
-21