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x in (-oo:+oo)
5*x+1/5 = 13 // - 13
5*x+1/5-13 = 0
5*x-64/5 = 0 // + 64/5
5*x = 64/5 // : 5
x = 64/5/5
x = 64/25
x = 64/25
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