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x in (-oo:+oo)
(1-x^2)/2 = (x^2-1)/3 // - (x^2-1)/3
(1-x^2)/2-((x^2-1)/3) = 0
(1-x^2)/2+(-1*(x^2-1))/3 = 0
(3*(1-x^2))/(2*3)+(-1*2*(x^2-1))/(2*3) = 0
3*(1-x^2)-1*2*(x^2-1) = 0
5-5*x^2 = 0
(5-5*x^2)/(2*3) = 0
(5-5*x^2)/(2*3) = 0 // * 2*3
5-5*x^2 = 0
-5*x^2 = -5 // : -5
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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