Question: What is the solution?

Solve -2*z - 14*z = 16 for z.

Answer: -1

Question: What is the solution?

Solve r = 18 - 14 for r.

Answer: 4

Question: What is the solution?

Solve -30*x + 74 + 106 = 0 for x.

Answer: 6

Question: What is the solution?

Solve 26*q = 12*q for q.

Answer:
0