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x/10-(x/15)-(4/10)-(5/15) = 0
x/10-(x/15)-2/5-1/3 = 0
1/30*x-11/15 = 0 // + 11/15
1/30*x = 11/15 // : 1/30
x = 11/15/1/30
x = 22
x = 22
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