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x in (-oo:+oo)
0 = (12-(3*x^2))/4 // - (12-(3*x^2))/4
0-((12-(3*x^2))/4) = 0
-((12-3*x^2)/4) = 0
(-1*(12-3*x^2))/4 = 0
( -1 )
-1 = 0
x belongs to the empty set
( 12-3*x^2 )
-3*x^2 = -12 // : -3
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in { 2, -2 }
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