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x in (-oo:+oo)
(3/4)*x^2-13 = 14 // - 14
(3/4)*x^2-14-13 = 0
3/4*x^2 = 27 // : 3/4
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { 6, -6 }
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