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