Question: What is the solution?

Solve f + 8*f - 27 = 0 for f.

Answer: 3

Question: What is the solution?

Solve 69*m - 3600 = -81*m for m.

Answer: 24

Question: What is the solution?

Solve 90 = -27*l + 36*l for l.

Answer: 10

Question: What is the solution?

Solve -24120 = 140*h + 233*h - 79*h + 66*h for h.

Answer:
-67