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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)
x/(x^2)-7 = 0
1*x^-1 = 7 // : 1
x^-1 = 7
-1 < 0
1/(x^1) = 7 // * x^1
1 = 7*x^1 // : 7
1/7 = x^1
x = 1/7
x = 1/7
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