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x in (-oo:+oo)
((8*x)/18)*(x+y) = 0
4/9*x*(x+y) = 0
( 4/9*x )
4/9*x = 0 // : 4/9
x = 0
( x+y )
x+y = 0 // - y
x = -y
x in { 0, -y }
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