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(8/5)*x-((2/3)*x) = 4/15 // - 4/15
(8/5)*x-((2/3)*x)-(4/15) = 0
(8/5)*x+(-2/3)*x-4/15 = 0
14/15*x-4/15 = 0 // + 4/15
14/15*x = 4/15 // : 14/15
x = 4/15/14/15
x = 2/7
x = 2/7
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