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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
(13*x+2*3+19)/(x+2) = 0
(13*x+25)/(x+2) = 0
13*x+25 = 0 // - 25
13*x = -25 // : 13
x = -25/13
x = -25/13
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