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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^2+7*x+19)/(x+4) = 0
X^2+7*x+19 = 0 // - X^2+19
7*x = -(X^2+19) // : 7
x = (-(X^2+19))/7
x = (-(X^2+19))/7
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