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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:-5/4) U (-5/4:-1) U (-1:+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+6 = 0
(3*x+6)/((x+1)*(4*x+5)) = 0
(3*x+6)/((x+1)*(4*x+5)) = 0 // * (x+1)*(4*x+5)
3*x+6 = 0
3*x+6 = 0 // - 6
3*x = -6 // : 3
x = -6/3
x = -2
x = -2
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