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