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X in (-oo:+oo)
(4/5)*X-(3/5) = 13 // - 13
(4/5)*X-(3/5)-13 = 0
(4/5)*X-3/5-13 = 0
4/5*X-68/5 = 0 // + 68/5
4/5*X = 68/5 // : 4/5
X = 68/5/4/5
X = 17
X = 17
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