bantu kak, soalnya susah

|x+5| ≤ |1-9x|
(x+5)² ≤ (1-9x)²
x²+10x+25 ≤ 1-18x+81x²
81x²-x²-18x-10x+1-25≥0
80x²-28x-24 ≥ 0
20x²-7x-6 ≥ 0
(4x-3)(5x+2) ≥ 0
4x=3
x=3/4
5x=-2
x=-2/5
x≤-2/5 atau x≥3/4