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7,5 = 6x + 8y/ x+y
7,5 ( x+y ) = 6x + 8y
7,5 x + 7,5 y + 6x + 8y
1,5 x= 0,5 y
y = 1,5x/0,5
y= 3x
maka x:y
x : 3x
1:3