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X in (-oo:+oo)
(3/4)*X-(2*X)-9-1 = 0
(3/4)*X-2*X-9-1 = 0
-5/4*X-10 = 0 // + 10
-5/4*X = 10 // : -5/4
X = 10/(-5/4)
X = -8
X = -8
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