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a in (-oo:+oo)
(1/5)*a+5*a = 13 // - 13
(1/5)*a+5*a-13 = 0
(1/5+5)*a-13 = 0 // + 13
(1/5+5)*a = 13 // : 1/5+5
a = 13/(1/5+5)
a = 13/(1/5+5)
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