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x in (-oo:+oo)
(1/2)*(x+5)*(3*x+6) = 0
1/2*(x+5)*(3*x+6) = 0
( 3*x+6 )
3*x+6 = 0 // - 6
3*x = -6 // : 3
x = -6/3
x = -2
( x+5 )
x+5 = 0 // - 5
x = -5
x in { -2, -5 }
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