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