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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)
(2*x+1)/(x+2)+3 = 0
(2*x+1)/(x+2)+(3*(x+2))/(x+2) = 0
3*(x+2)+2*x+1 = 0
5*x+7 = 0
(5*x+7)/(x+2) = 0
(5*x+7)/(x+2) = 0 // * x+2
5*x+7 = 0
5*x+7 = 0 // - 7
5*x = -7 // : 5
x = -7/5
x = -7/5
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