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