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x in (-oo:+oo)
x+13*x = 3/5 // - 3/5
x+13*x-(3/5) = 0
x+13*x-3/5 = 0
14*x-3/5 = 0 // + 3/5
14*x = 3/5 // : 14
x = 3/5/14
x = 3/70
x = 3/70
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