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