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x in (-oo:+oo)
5 = 5*x-(15/(-8)) // - 5*x-(15/(-8))
15/(-8)-(5*x)+5 = 0
15/(-8)-5*x+5 = 0
25/8-5*x = 0 // - 25/8
-5*x = -25/8 // : -5
x = -25/8/(-5)
x = 5/8
x = 5/8
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