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