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D( x )
x+1 = 0
9*x+9 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
9*x+9 = 0
9*x+9 = 0
9*x+9 = 0 // - 9
9*x = -9 // : 9
x = -9/9
x = -1
x in (-oo:-1) U (-1:+oo)
7/(9*x+9) = 7/(x+1)-(7/9) // - 7/(x+1)-(7/9)
7/(9*x+9)-(7/(x+1))+7/9 = 0
7/(9*x+9)-7*(x+1)^-1+7/9 = 0
7/(9*x+9)-7/(x+1)+7/9 = 0
(7*9*(x+1))/(9*(9*x+9)*(x+1))+(-7*9*(9*x+9))/(9*(9*x+9)*(x+1))+(7*(9*x+9)*(x+1))/(9*(9*x+9)*(x+1)) = 0
7*9*(x+1)-7*9*(9*x+9)+7*(9*x+9)*(x+1) = 0
63*x^2-504*x+126*x-504+63 = 0
63*x^2-378*x-441 = 0
63*x^2-378*x-441 = 0
63*(x^2-6*x-7) = 0
x^2-6*x-7 = 0
DELTA = (-6)^2-(-7*1*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)+6)/(1*2) or x = (6-64^(1/2))/(1*2)
x = 7 or x = -1
63*(x+1)*(x-7) = 0
(63*(x+1)*(x-7))/(9*(9*x+9)*(x+1)) = 0
(63*(x+1)*(x-7))/(9*(9*x+9)*(x+1)) = 0 // * 9*(9*x+9)*(x+1)
63*(x+1)*(x-7) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-7 )
x-7 = 0 // + 7
x = 7
x in { -1}
x = 7
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