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D( x )
x+6 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:+oo)
(X^2+11*x+28)/(x+6) = 0
X^2+11*x+28 = 0 // - X^2+28
11*x = -(X^2+28) // : 11
x = (-(X^2+28))/11
x = (-(X^2+28))/11
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