Question: What is the solution?

Solve -28*a - 27 - 90 = 163 for a.

Answer: -10

Question: What is the solution?

Solve 11 = 3*r - 4 for r.

Answer: 5

Question: What is the solution?

Solve 142 - 205 = 21*j for j.

Answer: -3

Question: What is the solution?

Solve -6*n + 16*n = -6*n for n.

Answer:
0