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x in (-oo:+oo)
(5*x)/8-13 = 50 // - 50
(5*x)/8-50-13 = 0
5/8*x-63 = 0 // + 63
5/8*x = 63 // : 5/8
x = 63/5/8
x = 504/5
x = 504/5
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