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x in (-oo:+oo)
96 = (3*x*x)/2 // - (3*x*x)/2
96-((3*x*x)/2) = 0
(-3/2)*x^2+96 = 0
-3/2*x^2 = -96 // : -3/2
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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