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D( x )
3*x = 0
x+5 = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:0) U (0:+oo)
(x+1)/(x+5)+2 = (9*x+2)/(3*x) // - (9*x+2)/(3*x)
(x+1)/(x+5)-((9*x+2)/(3*x))+2 = 0
(x+1)/(x+5)+(-1*(9*x+2))/(3*x)+2 = 0
(3*x*(x+1))/(3*x*(x+5))+(-1*(9*x+2)*(x+5))/(3*x*(x+5))+(2*3*x*(x+5))/(3*x*(x+5)) = 0
3*x*(x+1)-1*(9*x+2)*(x+5)+2*3*x*(x+5) = 0
6*x^2-6*x^2-44*x+30*x-10 = 0
-14*x-10 = 0
(-14*x-10)/(3*x*(x+5)) = 0
(-14*x-10)/(3*x*(x+5)) = 0 // * 3*x*(x+5)
-14*x-10 = 0
-14*x-10 = 0 // + 10
-14*x = 10 // : -14
x = 10/(-14)
x = -5/7
x = -5/7
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