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