0.9-(5分之4-3x+0.2x)=2分之3-x

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0.9-(5分之4-3x+0.2x)=2分之3-x
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0.9-(5分之4-3x+0.2x)=2分之3-x
0.9-(5分之4-3x+0.2x)=2分之3-x

0.9-(5分之4-3x+0.2x)=2分之3-x
0.9-(4/5-3x+0.2x)=3/2-x
0.9-0.8+3x -0.2x = 1.5-x
3.8x = 1.4
x = 7/19

2x-4分之3-x除以[x+2-x-2分之5]
=(3-x)/(2x-4)÷[(x+2)-5/(x-2)]
=(3-x)/2(x-2)÷(x²-4-5)/(x-2)
=(3-x)/(x²-9)
=-(x-3)/(x-3)(x+3)
=-1/(x+3)