0.4x-2-5-0.5x≤0.03-2/3x
-7-0.1x≤0.03-2/3x
2/3x-1/10≤7.03
20-3/10x≤7.03
17/10x≤7.03
x≤10/17*7.03
x≤703/170≈4.135294118≈4.14