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x in (-oo:+oo)
x^2+((3/4)*x)^2-2704 = 0
25/16*x^2 = 2704 // : 25/16
x^2 = 43264/25
x^2 = 43264/25 // ^ 1/2
abs(x) = 208/5
x = 208/5 or x = -208/5
x in { 208/5, -208/5 }
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