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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x-7+1 = 14/x-7+3 // - 14/x-7+3
(2*x)/x-(14/x)-7-3+1+7 = 0
(2*x)/x-14*x^-1-7-3+1+7 = 0
-14*x^-1 = 0 // : -14
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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