5,4 - 1,5x ≥ 0,3x - 3,6;

1. Add 1.5x to both sides: 5.4 ≥ 1.8x - 3.6.

2. Add 3.6 to both sides: 9 ≥ 1.8x.

3. Divide both sides by 1.8: 5 ≥ x.

Answer: x ≤ 5