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D( x )
x+13 = 0
x+13 = 0
x+13 = 0
x+13 = 0 // - 13
x = -13
x in (-oo:-13) U (-13:+oo)
(x^2-(11*x))/(x+13) = 0
(x^2-11*x)/(x+13) = 0
x^2-11*x = 0
x*(x-11) = 0
x-11 = 0 // + 11
x = 11
x*(x-11) = 0
(x*(x-11))/(x+13) = 0
( x-11 )
x-11 = 0 // + 11
x = 11
( x )
x = 0
x in { 11, 0 }
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