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x in (-oo:+oo)
((8*x)/15)*x+9/9 = 11/18 // - 11/18
((8*x)/15)*x+9/9-(11/18) = 0
((8*x)/15)*x+9/9-11/18 = 0
8/15*x^2 = -7/18 // : 8/15
x^2 = -35/48
x belongs to the empty set
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