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D( x )
1.69^2 = 0
1.69^2 = 0
1.69^2 = 0
1.69^2 = 0
x belongs to the empty set
x in (-oo:+oo)
x/(1.69^2) = 23 // - 23
x/(1.69^2)-23 = 0
(1/(1.69^2))*x-23 = 0 // + 23
(1/(1.69^2))*x = 23 // : 1/(1.69^2)
x = 23/(1/(1.69^2))
x = 23*1.69^2
x = 23*1.69^2
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