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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)
8/(9*x+9) = 4/(x+1)-(2/9) // - 4/(x+1)-(2/9)
8/(9*x+9)-(4/(x+1))+2/9 = 0
8/(9*x+9)-4*(x+1)^-1+2/9 = 0
8/(9*x+9)-4/(x+1)+2/9 = 0
(8*9*(x+1))/(9*(9*x+9)*(x+1))+(-4*9*(9*x+9))/(9*(9*x+9)*(x+1))+(2*(9*x+9)*(x+1))/(9*(9*x+9)*(x+1)) = 0
8*9*(x+1)-4*9*(9*x+9)+2*(9*x+9)*(x+1) = 0
18*x^2-252*x+36*x-252+18 = 0
18*x^2-216*x-234 = 0
18*x^2-216*x-234 = 0
18*(x^2-12*x-13) = 0
x^2-12*x-13 = 0
DELTA = (-12)^2-(-13*1*4)
DELTA = 196
DELTA > 0
x = (196^(1/2)+12)/(1*2) or x = (12-196^(1/2))/(1*2)
x = 13 or x = -1
18*(x+1)*(x-13) = 0
(18*(x+1)*(x-13))/(9*(9*x+9)*(x+1)) = 0
(18*(x+1)*(x-13))/(9*(9*x+9)*(x+1)) = 0 // * 9*(9*x+9)*(x+1)
18*(x+1)*(x-13) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-13 )
x-13 = 0 // + 13
x = 13
x in { -1}
x = 13
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