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x in (-oo:+oo)
(x/2)*(2*x+18) = 0
1/2*x*(2*x+18) = 0
( 1/2*x )
1/2*x = 0 // : 1/2
x = 0
( 2*x+18 )
2*x+18 = 0 // - 18
2*x = -18 // : 2
x = -18/2
x = -9
x in { 0, -9 }
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