7/13+16/9+6/13-8/9(3/4-3/4*2/5)/1/5*54/5*(X-2/5)=8

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7/13+16/9+6/13-8/9(3/4-3/4*2/5)/1/5*54/5*(X-2/5)=8
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7/13+16/9+6/13-8/9(3/4-3/4*2/5)/1/5*54/5*(X-2/5)=8
7/13+16/9+6/13-8/9
(3/4-3/4*2/5)/1/5*5
4/5*(X-2/5)=8

7/13+16/9+6/13-8/9(3/4-3/4*2/5)/1/5*54/5*(X-2/5)=8
7/13+16/9+6/13-8/9
=(7/13+6/13)+(16/9-8/9)
=1+8/9
=17/9;
(3/4-3/4*2/5)/1/5*5
=(3/4)×(1-2/5)×25
=(3/4)×(3/5)×25
=45/4;
4/5*(X-2/5)=8
x-2/5=10;
x=10+2/5;
x=10.4;
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