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