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D( X )
X+4 = 0
X+4 = 0
X+4 = 0
X+4 = 0 // - 4
X = -4
X in (-oo:-4) U (-4:+oo)
X/7 = 5/(X+4) // - 5/(X+4)
X/7-(5/(X+4)) = 0
X/7-5*(X+4)^-1 = 0
X/7-5/(X+4) = 0
(-5*7)/(7*(X+4))+(X*(X+4))/(7*(X+4)) = 0
X*(X+4)-5*7 = 0
X^2+4*X-35 = 0
X^2+4*X-35 = 0
X^2+4*X-35 = 0
DELTA = 4^2-(-35*1*4)
DELTA = 156
DELTA > 0
X = (156^(1/2)-4)/(1*2) or X = (-156^(1/2)-4)/(1*2)
X = (2*39^(1/2)-4)/2 or X = (-2*39^(1/2)-4)/2
(X-((-2*39^(1/2)-4)/2))*(X-((2*39^(1/2)-4)/2)) = 0
((X-((-2*39^(1/2)-4)/2))*(X-((2*39^(1/2)-4)/2)))/(7*(X+4)) = 0
((X-((-2*39^(1/2)-4)/2))*(X-((2*39^(1/2)-4)/2)))/(7*(X+4)) = 0 // * 7*(X+4)
(X-((-2*39^(1/2)-4)/2))*(X-((2*39^(1/2)-4)/2)) = 0
( X-((-2*39^(1/2)-4)/2) )
X-((-2*39^(1/2)-4)/2) = 0 // + (-2*39^(1/2)-4)/2
X = (-2*39^(1/2)-4)/2
( X-((2*39^(1/2)-4)/2) )
X-((2*39^(1/2)-4)/2) = 0 // + (2*39^(1/2)-4)/2
X = (2*39^(1/2)-4)/2
X in { (-2*39^(1/2)-4)/2, (2*39^(1/2)-4)/2 }
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