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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7*x)/x+1/4-1 = 7/x+7/8-1 // - 7/x+7/8-1
(7*x)/x-(7/x)+1/4-(7/8)-1+1 = 0
(7*x)/x-7*x^-1+1/4-7/8-1+1 = 0
-7*x^-1 = -51/8 // : -7
x^-1 = 51/56
-1 < 0
1/(x^1) = 51/56 // * x^1
1 = 51/56*x^1 // : 51/56
56/51 = x^1
x = 56/51
x = 56/51
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