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D( x )
x+1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
1/(x+1)+5 = 11/(x+1) // - 11/(x+1)
1/(x+1)-(11/(x+1))+5 = 0
1/(x+1)-11*(x+1)^-1+5 = 0
1/(x+1)-11/(x+1)+5 = 0
1/(x+1)-11/(x+1)+(5*(x+1))/(x+1) = 0
5*(x+1)-11+1 = 0
5*x-10+5 = 0
5*x-5 = 0
(5*x-5)/(x+1) = 0
(5*x-5)/(x+1) = 0 // * x+1
5*x-5 = 0
5*x-5 = 0 // + 5
5*x = 5 // : 5
x = 5/5
x = 1
x = 1
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