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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+1 = -7/2 // + -7/2
5/x-(-7/2)+1 = 0
5/x+7/2+1 = 0
5*x^-1 = -9/2 // : 5
x^-1 = -9/10
-1 < 0
1/(x^1) = -9/10 // * x^1
1 = -9/10*x^1 // : -9/10
-10/9 = x^1
x = -10/9
x = -10/9
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