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x in (-oo:+oo)
25-((1/4)*x^2) = 0
(-1/4)*x^2+25 = 0
-1/4*x^2 = -25 // : -1/4
x^2 = 100
x^2 = 100 // ^ 1/2
abs(x) = 10
x = 10 or x = -10
x in { 10, -10 }
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