一元一次方程：
1.2(x-2)-3(4x-1)=9(1-x)
4x-4-12x+3=9-9x
-8x+9x=9-3+4
x=10
2.11x+64-2x=100-9x
11x-2x+9x=100-64
18x=36
x=2
3.15-(8-5x)=7x+(4-3x)
15-8+5x=7x+4-3x
5x-7x+3x=4-15+8
x=-3
4.3(x-7)-2[9-4(2-x)]=22
3x-21-2(9-8+4x)=22
3x-21-18+16-8x=22
-5x=22+23
-5x=45
x=-9
6.2(x-2)+2=x+1
2x-4+2=x+1
2x-x=1+4-2
x=3
7.0.4(x-0.2)+1.5=0.7x-0.38
0.4x-0.08+1.5=0.7x-0.38
-0.3x=0.08-0.38-1.5
-0.3x=-1.8
x=6
8.30x-10(10-x)=100
30x-100+10x=100
40x=200
x=5
9.4(x+2)=5(x-2)
4x+8=5x-10
x=18
10.120-4(x+5)=25
120-4x-20=25
4x=120-20-25
4x=75
x=18.75
11.15x+863-65x=54
-50x=-863-54
-50x=-917
x=58.64
12.12.3(x-2)+1=x-(2x-1)
12.3x-24.6+1=-x+1
4x=24.6
x=6.15
13.11x+64-2x=100-9x
9x+9x=100-64
18x=36
x=2
14.14.59+x-25.31=0
x-10.72=0
x=10.72
15.x-48.32+78.51=80
x+30.19=80
x=49.81