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X in (-oo:+oo)
3*X-((9/2)*X)-6 = 0
3*X+(-9/2)*X-6 = 0
-3/2*X-6 = 0 // + 6
-3/2*X = 6 // : -3/2
X = 6/(-3/2)
X = -4
X = -4
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