初一计算题!!!!!!!!!

(2-0.3x)/0.4=(0.2x)/0.3-1
8-3/4x=2/3x-5
17/12x=13
x=156/17

(2-0.3x)/0.4=(0.2x)/0.3-1
3(20-3x)=4(2)-12
60-9x=8-12
-9x=-60+8-12
-9x=-64
x=64/9

((2-0.3x)/0.4)*1.2=((0.2x)/0.3)*1.2-1*1.2
(2-0.3x)*3==(0.2x)*4-1.2
6-0.9x=0.8x-1.2
6+1.2=0.8x+0.9x
7.2=1.7x
x=7.2/1.7=72/17

(2-0.3x)/0.4=(0.2x)/0.3-1
8-3/4x=2/3x-5
17/12x=13
x=156/17

5-3/4x=2/3x-1
-3/4x-2/3x=-1-5
17/12x=6
x=72/17

(2-0.3x)/0.4=(0.2x-0.3)/0.3 ………………通分
0.3(2-0.3x)=0.4(0.2x-0.3)
0.6-0.09x=0.08x-0.12
0.17x=0.72
x=0.72/0.17=72/17