X=2+3l
X=3+5m
X=5+7n Where L ,m,n Are Integers
So 2+3l=3+5m
3l=1+5m
We Can See That M=1+3d Where D Is Integer
So L=2+5d
Then X=8+15 D
8+15d= =5 +7d
So 15 D=-3+7n

Wecan See That N=9+15f So D= 4+7f
Then X=8+15(4+7f) =68+105 F
So X-68=105 F

Then X-68 Can Be Divided By 105