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x in (-oo:+oo)
(5*x)/8-8 = x // - x
(5*x)/8-x-8 = 0
-3/8*x-8 = 0 // + 8
-3/8*x = 8 // : -3/8
x = 8/(-3/8)
x = -64/3
x = -64/3
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