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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 7/8 // - 7/8
2/x-(7/8) = 0
2/x-7/8 = 0
2*x^-1 = 7/8 // : 2
x^-1 = 7/16
-1 < 0
1/(x^1) = 7/16 // * x^1
1 = 7/16*x^1 // : 7/16
16/7 = x^1
x = 16/7
x = 16/7
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