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(3/5)*x-(1/5) = 2/15 // - 2/15
(3/5)*x-(1/5)-(2/15) = 0
(3/5)*x-1/5-2/15 = 0
3/5*x-1/3 = 0 // + 1/3
3/5*x = 1/3 // : 3/5
x = 1/3/3/5
x = 5/9
x = 5/9
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