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(1/5)*x+5*x = 13 // - 13
(1/5)*x+5*x-13 = 0
(1/5+5)*x-13 = 0 // + 13
(1/5+5)*x = 13 // : 1/5+5
x = 13/(1/5+5)
x = 13/(1/5+5)
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