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D( x )
x+11 = 0
x+11 = 0
x+11 = 0
x+11 = 0 // - 11
x = -11
x in (-oo:-11) U (-11:+oo)
(3*x-21)/(x+11)+8 = 0
(3*x-21)/(x+11)+(8*(x+11))/(x+11) = 0
8*(x+11)+3*x-21 = 0
11*x+67 = 0
(11*x+67)/(x+11) = 0
(11*x+67)/(x+11) = 0 // * x+11
11*x+67 = 0
11*x+67 = 0 // - 67
11*x = -67 // : 11
x = -67/11
x = -67/11
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