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x in (-oo:+oo)
(9/16)*x^2 = 36 // - 36
(9/16)*x^2-36 = 0
9/16*x^2 = 36 // : 9/16
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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