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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x*(1/x+2) = 14 // - 14
x*(1/x+2)-14 = 0
x*(x^-1+2)-14 = 0
x*(x^-1+2)-14 = 0
2*x-13 = 0
2*x-13 = 0
2*x-13 = 0 // + 13
2*x = 13 // : 2
x = 13/2
x = 13/2
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