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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
32/x+4 = 8/7 // - 8/7
32/x-(8/7)+4 = 0
32/x-8/7+4 = 0
32*x^-1 = -20/7 // : 32
x^-1 = -5/56
-1 < 0
1/(x^1) = -5/56 // * x^1
1 = -5/56*x^1 // : -5/56
-56/5 = x^1
x = -56/5
x = -56/5
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