(5/8x-9)÷(3/8x+9)=2/3
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(5/8x-9)÷(3/8x+9)=2/3(5/8x-9)÷(3/8x+9)=2/3(5/8x-9)÷(3/8x+9)=2/3(5/8x-9)÷(3/8x+9)=2/35/8x-9=2/3(3/8x+
(5/8x-9)÷(3/8x+9)=2/3
(5/8x-9)÷(3/8x+9)=2/3
(5/8x-9)÷(3/8x+9)=2/3
(5/8x-9)÷(3/8x+9)=2/3
5/8x-9=2/3(3/8x+9)
5/8x-9=1/4x+6
5/8x-1/4x=6+9
3/8x=15
x=15÷3/8
x=40
(5/8x-9)=2/3*(3/8x+9)
5/8x-9=2/8x+6
3/8x=15
x=40
上题等价于
5/8x-9=2/3*(3/8x+9)
解得x=20
(5/8x-9)÷(3/8x+9)=2/3
3*5/8x-3*9=2*3/8x+2*9
15/8x-6/8x=9*5
9/8x=9*5
x=40
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