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x in (-oo:+oo)
((2*x)/2)*x-19 = 0
1*x^2 = 19 // : 1
x^2 = 19
x^2 = 19 // ^ 1/2
abs(x) = 19^(1/2)
x = 19^(1/2) or x = -19^(1/2)
x in { 19^(1/2), -19^(1/2) }
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