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5 = (1/5)*x^2 // - (1/5)*x^2
5-((1/5)*x^2) = 0
(-1/5)*x^2+5 = 0
-1/5*x^2 = -5 // : -1/5
x^2 = 25
x^2 = 25 // ^ 1/2
abs(x) = 5
x = 5 or x = -5
x in { 5, -5 }
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