2{2【4(5x-1)-8】-20}-7=1
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2{2【4(5x-1)-8】-20}-7=1
2{2【4(5x-1)-8】-20}-7=1
2{2【4(5x-1)-8】-20}-7=1
2{2【4(5x-1)-8】-20}-7=1
2{2【4(5x-1)-8】-20}=8
2【4(5x-1)-8】-20=4
2【4(5x-1)-8】=24
4(5x-1)-8=12
4(5x-1)=20
5x-1=5
5x=6
x=1.2
2{2【4(5x-1)-8】-20}-7=1;
2{2【4(5x-1)-8】-20}=8;
2【4(5x-1)-8】-20=4;
2(4(5x-1)-8)=24;
4(5x-1)-8=12;
4(5x-1)=20;
5x-1=5;
x=6/5;
x=1.2
2{2(20X-4-8)-20}-7=1
2(40X-24-20)-7=1
80X-88-7=1
80X=96
X=5/6
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