(50-x)/(54-x)=7/9 快

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(50-x)/(54-x)=7/9快(50-x)/(54-x)=7/9快(50-x)/(54-x)=7/9快(50-x)/(54-x)=7/99(50-x)=7(54-x)450-9x=378-7x2

(50-x)/(54-x)=7/9 快
(50-x)/(54-x)=7/9
快

(50-x)/(54-x)=7/9 快
(50-x)/(54-x)=7/9
9(50-x)=7(54-x)
450-9x=378-7x
2x=72
x=36

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