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x in (-oo:+oo)
(x+5/3)*(9*x+30) = 0
( 9*x+30 )
9*x+30 = 0 // - 30
9*x = -30 // : 9
x = -30/9
x = -10/3
( x+5/3 )
x+5/3 = 0 // - 5/3
x = -5/3
x in { -10/3, -5/3 }
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