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x in (-oo:+oo)
2/2 = ((2*x)/2)*x // - ((2*x)/2)*x
2/2-(((2*x)/2)*x) = 0
2/2-x^2 = 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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