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