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D( x )
x+6 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:+oo)
1/(x+6) = 1 // - 1
1/(x+6)-1 = 0
1/(x+6)+(-1*(x+6))/(x+6) = 0
1-1*(x+6) = 0
-x-5 = 0
(-x-5)/(x+6) = 0
(-x-5)/(x+6) = 0 // * x+6
-x-5 = 0
-x-5 = 0 // + 5
-x = 5 // * -1
x = -5
x = -5
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