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(1/5)*x+(1/3)*x = 2/3 // - 2/3
(1/5)*x+(1/3)*x-(2/3) = 0
(1/5)*x+(1/3)*x-2/3 = 0
8/15*x-2/3 = 0 // + 2/3
8/15*x = 2/3 // : 8/15
x = 2/3/8/15
x = 5/4
x = 5/4
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