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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)
(x+13)/(x+2)+1 = 11/(x+2) // - 11/(x+2)
(x+13)/(x+2)-(11/(x+2))+1 = 0
(x+13)/(x+2)-11*(x+2)^-1+1 = 0
(x+13)/(x+2)-11/(x+2)+1 = 0
(x+13)/(x+2)-11/(x+2)+(1*(x+2))/(x+2) = 0
1*(x+2)+x-11+13 = 0
x+x+2+2 = 0
2*x+4 = 0
(2*x+4)/(x+2) = 0
(2*x+4)/(x+2) = 0 // * x+2
2*x+4 = 0
2*x+4 = 0 // - 4
2*x = -4 // : 2
x = -4/2
x = -2
x in { -2}
x belongs to the empty set
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