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D( x )
x+1 = 0
4*x-5 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
4*x-5 = 0
4*x-5 = 0
4*x-5 = 0 // + 5
4*x = 5 // : 4
x = 5/4
x in (-oo:-1) U (-1:5/4) U (5/4:+oo)
3/(x+1) = 9/(4*x-5) // - 9/(4*x-5)
3/(x+1)-(9/(4*x-5)) = 0
3/(x+1)-9*(4*x-5)^-1 = 0
3/(x+1)-9/(4*x-5) = 0
(3*(4*x-5))/((x+1)*(4*x-5))+(-9*(x+1))/((x+1)*(4*x-5)) = 0
3*(4*x-5)-9*(x+1) = 0
3*x-24 = 0
(3*x-24)/((x+1)*(4*x-5)) = 0
(3*x-24)/((x+1)*(4*x-5)) = 0 // * (x+1)*(4*x-5)
3*x-24 = 0
3*x-24 = 0 // + 24
3*x = 24 // : 3
x = 24/3
x = 8
x = 8
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