(120-120÷x)÷(120÷x+120÷x+5)=3

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(120-120÷x)÷(120÷x+120÷x+5)=3
(120-120÷x)÷(120÷x+120÷x+5)=3

(120-120÷x)÷(120÷x+120÷x+5)=3
(120-120/x)/(120/X+120/X+5)=3
120-120/X=360/3X+360/3X+15
120-15-120/X=720/6X
105=6(120/X)+120/X
105=7(120/X)
120/X=15
X=120/15
X=8