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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(143*x)/(x^2)-144 = 0
143*x^-1 = 144 // : 143
x^-1 = 144/143
-1 < 0
1/(x^1) = 144/143 // * x^1
1 = 144/143*x^1 // : 144/143
143/144 = x^1
x = 143/144
x = 143/144
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