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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-3 = -7 // + 7
5/x-3+7 = 0
5*x^-1 = -4 // : 5
x^-1 = -4/5
-1 < 0
1/(x^1) = -4/5 // * x^1
1 = -4/5*x^1 // : -4/5
-5/4 = x^1
x = -5/4
x = -5/4
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