Đáp án:
Nếu x ≤-4
=> 3(-x-4)-(-2x-1)-5(-x-3)+9-x=5
<=> x=-8/3
Nếu -4 ≤x ≤-3
<=> 3(x+4)-(-2x-1)-5(-x-3)+9-x=5
<=>x =-32/9
Nếu -3 ≤x ≤-1/2
<=> 3(x+4)-(-2x-1)-5(x+3)+9-x=5
<=>x=2
Nếu -1/2 ≤x ≤9
<=> 3(x+4)-(2x+1)-5(x+3)+9-x=5
<=> x=0
Nếu x ≥9
<=> 3(x+4)-(2x+1)-5(x+3)+x-9=5
<=>-6