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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-27 = 7/x // - 7/x
4*x-(7/x)-27 = 0
4*x-7*x^-1-27 = 0
4*x^1-7*x^-1-27*x^0 = 0
(4*x^2-27*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-27*x^1-7*x^0) = 0
x^1
4*x^2-27*x-7 = 0
4*x^2-27*x-7 = 0
DELTA = (-27)^2-(-7*4*4)
DELTA = 841
DELTA > 0
x = (841^(1/2)+27)/(2*4) or x = (27-841^(1/2))/(2*4)
x = 7 or x = -1/4
x in { -1/4, 7}
x in { -1/4, 7 }
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