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x in (-oo:+oo)
(3/4)*x^2-19 = 26 // - 26
(3/4)*x^2-26-19 = 0
3/4*x^2 = 45 // : 3/4
x^2 = 60
x^2 = 60 // ^ 1/2
abs(x) = 2*15^(1/2)
x = 2*15^(1/2) or x = -(2*15^(1/2))
x in { 2*15^(1/2), -(2*15^(1/2)) }
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