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D( x )
3*x-1 = 0
3*x+1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x in (-oo:-1/3) U (-1/3:1/3) U (1/3:+oo)
5/(3*x+1)-((27*x)/(3*x-1)) = -9 // + 9
5/(3*x+1)-((27*x)/(3*x-1))+9 = 0
5/(3*x+1)-27*x*(3*x-1)^-1+9 = 0
5/(3*x+1)+(-27*x)/(3*x-1)+9 = 0
(5*(3*x-1))/((3*x+1)*(3*x-1))+(-27*x*(3*x+1))/((3*x+1)*(3*x-1))+(9*(3*x+1)*(3*x-1))/((3*x+1)*(3*x-1)) = 0
5*(3*x-1)-27*x*(3*x+1)+9*(3*x+1)*(3*x-1) = 0
81*x^2-81*x^2-12*x-9-5 = 0
-12*x-14 = 0
(-12*x-14)/((3*x+1)*(3*x-1)) = 0
(-12*x-14)/((3*x+1)*(3*x-1)) = 0 // * (3*x+1)*(3*x-1)
-12*x-14 = 0
-12*x-14 = 0 // + 14
-12*x = 14 // : -12
x = 14/(-12)
x = -7/6
x = -7/6
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