3(5-4x)=9
5-4x=9÷3
4x=5-3
4x=2
x=0.5
5/8x-1/3x-1/2=2/3 两边乘24
15x-8x-12=16
7x=12+16
7x=28
x=4
2/5(1-0.375x)=4/15
1-0.375x=4/15÷2/5
0.375x=1-2/3
3/8x=1/3
x=1/3÷3/8
x=8/9
3(5-4x)=9
5-4x=9÷3
4x=5-3
4x=2
x=0.5
5/8x-1/3x-1/2=2/3 两边乘24
15x-8x-12=16
7x=12+16
7x=28
x=4
2/5(1-0.375x)=4/15
1-0.375x=4/15÷2/5
0.375x=1-2/3
3/8x=1/3
x=1/3÷3/8
x=8/9