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