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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
36/x = 8/7 // - 8/7
36/x-(8/7) = 0
36/x-8/7 = 0
36*x^-1 = 8/7 // : 36
x^-1 = 2/63
-1 < 0
1/(x^1) = 2/63 // * x^1
1 = 2/63*x^1 // : 2/63
63/2 = x^1
x = 63/2
x = 63/2
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