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x in (-oo:+oo)
88 = ((5*x^1)/4)*x // - ((5*x^1)/4)*x
88-(((5*x^1)/4)*x) = 0
(-5/4)*x^2+88 = 0
-5/4*x^2 = -88 // : -5/4
x^2 = 352/5
x^2 = 352/5 // ^ 1/2
abs(x) = (352/5)^(1/2)
x = (352/5)^(1/2) or x = -(352/5)^(1/2)
x in { (352/5)^(1/2), -(352/5)^(1/2) }
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