1,3/5X-2/5=1/6
3/5X=1/6+2/5
3/5X=17/30
X =17/30÷3/5
X=17/18
2,3/4X+3/2X=17
9/4X=17
X =17÷9/4
X=68/9
3,4/7X+1/9÷5/12=4/5
4/7X+4/15=4/5
4/7X=4/5-4/15
4/7X=8/15
X=8/15÷4/7
X=14/15
4,2/5﹙X+2﹚=8
2/5X+4/5=8
2/5X=8-4/5
2/5X=7又1/5
X=36/5÷2/5
X=18
1,3/5X-2/5=1/6
3/5X=1/6+2/5
3/5X=17/30
X =17/30÷3/5
X=17/18
2,3/4X+3/2X=17
9/4X=17
X =17÷9/4
X=68/9
3,4/7X+1/9÷5/12=4/5
4/7X+4/15=4/5
4/7X=4/5-4/15
4/7X=8/15
X=8/15÷4/7
X=14/15
4,2/5﹙X+2﹚=8
2/5X+4/5=8
2/5X=8-4/5
2/5X=7又1/5
X=36/5÷2/5
X=18