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x in (-oo:+oo)
81/33 = 5.5*x // - 5.5*x
81/33-(5.5*x) = 0
81/33-5.5*x = 0
27/11-5.5*x = 0 // - 27/11
-5.5*x = -27/11 // : -5.5
x = -27/11/(-5.5)
x = 0.44628099
x = 0.44628099
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