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(8/15)*x = (1/15)*x+2/5 // - (1/15)*x+2/5
(8/15)*x-((1/15)*x)-(2/5) = 0
(8/15)*x+(-1/15)*x-2/5 = 0
7/15*x-2/5 = 0 // + 2/5
7/15*x = 2/5 // : 7/15
x = 2/5/7/15
x = 6/7
x = 6/7
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