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x in (-oo:+oo)
((1/2)*x+2)*((2/3)*x+6)*((1/6)*x-1) = 0
(1/2*x+2)*(2/3*x+6)*(1/6*x-1) = 0
( 1/2*x+2 )
1/2*x+2 = 0 // - 2
1/2*x = -2 // : 1/2
x = -2/1/2
x = -4
( 1/6*x-1 )
1/6*x-1 = 0 // + 1
1/6*x = 1 // : 1/6
x = 1/1/6
x = 6
( 2/3*x+6 )
2/3*x+6 = 0 // - 6
2/3*x = -6 // : 2/3
x = -6/2/3
x = -9
x in { -4, 6, -9 }
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