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x in (-oo:+oo)
3*x^2+64 = (2*x^2)/2 // - (2*x^2)/2
3*x^2-((2*x^2)/2)+64 = 0
3*x^2-x^2+64 = 0
2*x^2 = -64 // : 2
x^2 = -32
x belongs to the empty set
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