2/3x=5/12 5/8除x=5/32 4/15x=20 1/2x+8/9=17/18 24-1/7x=3 2/3x-

2/3x=5/12
x=5/12÷2/3
x=5/12×3/2
x=5/8
5/8÷x=5/32
x=5/8÷5/32
x=5/8×32/5
x=4
4/15x=20
x=20÷4/15
x=20×15/4
x=75
1/2x+8/9=17/18
1/2x=17/18-8/9
1/2x=1/18
x=1/9
24-1/7x=3
1/7x=21
x=147
2/3x-3/4=7/20
2/3x=11/10
x=11/10÷2/3
x=33/20
x=1.65
3/4÷（3/4）=3/4+（1/4）=2/3×（3/2）=1