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D( x )
x+15 = 0
x+15 = 0
x+15 = 0
x+15 = 0 // - 15
x = -15
x in (-oo:-15) U (-15:+oo)
(X^2+9*x+20)/(x+15) = 0
X^2+9*x+20 = 0 // - X^2+20
9*x = -(X^2+20) // : 9
x = (-(X^2+20))/9
x = (-(X^2+20))/9
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