关于一元一次方程的

（1）0.6x+0.3=0.9x-0.2
0.9x-0.6x=0.3+0.2
0.3x=0.5
x=0.5/0.5=5/3
(2)3(x-1)-7(x+5)=30(x+1)
3x-3-7x-35=30x+30
30x-3x+7x=-3-35-30
34x=-68
x=-68/34=-2
(3)(2x+1)/3-(10x+1)/6=1
两边乘6
2(2x+1)-(10x+1)=6
4x+4-10x-1=6
10x-4x=4-1-6
6x=-3
x=-3/6=-1/2
(4)2(x-2)/0.3-(x-2)/0.15=1.2-x
两边乘0.3
2(x-2)-2(x-2)=0.3(1.2-x)
0.36-0.3x=0
3x=0.36
x=0.36/3=0.12
(5)(0.1x)/0.2-(0.27x+0.18)/0.04=1
两边乘0.2
0.1x-5(0.27x+0.18)=0.2
0.1x-1.35x-0.9=0.2
1.35x-0.1x=-0.9-0.2
1.25x=-1.1
x=-1.1/1.25=-0.88
(6)3/2[2/3(1/4x+1)+2]-5/2=(2x/3)
(1/4x+1)+3/2*2-5/2=2x/3
1/4x+1+3-5/2=2x/3
2x/3-1/4x=1+3-5/2
5x/12=3/2
x=(3/2)*(12/5)=18/5
(7)1/2(1/2x-1)-1=1
1/2(1/2x-1)=1+1=2
1/2x-1=2*2=4
1/2x=4+1=5
x=5*2=10
(8)1/2x-(9x-2)/6-2=0
两边乘6
3x-(9x-2)-2*6=0
3x-9x+2-12=0
9x-3x=2-12
6x=-10
x=-10/6=-5/3