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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
532/x+3 = 79 // - 79
532/x-79+3 = 0
532*x^-1 = 76 // : 532
x^-1 = 1/7
-1 < 0
1/(x^1) = 1/7 // * x^1
1 = 1/7*x^1 // : 1/7
7 = x^1
x = 7
x = 7
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