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x in (-oo:+oo)
9/2 = x/6 // - x/6
9/2-(x/6) = 0
9/2-1/6*x = 0 // - 9/2
-1/6*x = -9/2 // : -1/6
x = -9/2/(-1/6)
x = 27
x = 27
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