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D( x )
3*x-3 = 0
x+1 = 0
3*x-3 = 0
3*x-3 = 0
3*x-3 = 0 // + 3
3*x = 3 // : 3
x = 3/3
x = 1
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:1) U (1:+oo)
7/(x+1) = (2*x+4)/(3*x-3) // - (2*x+4)/(3*x-3)
7/(x+1)-((2*x+4)/(3*x-3)) = 0
7/(x+1)+(-1*(2*x+4))/(3*x-3) = 0
(7*(3*x-3))/((x+1)*(3*x-3))+(-1*(2*x+4)*(x+1))/((x+1)*(3*x-3)) = 0
7*(3*x-3)-1*(2*x+4)*(x+1) = 0
15*x-2*x^2-25 = 0
15*x-2*x^2-25 = 0
15*x-2*x^2-25 = 0
DELTA = 15^2-(-25*(-2)*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-15)/(-2*2) or x = (-25^(1/2)-15)/(-2*2)
x = 5/2 or x = 5
(x-5/2)*(x-5) = 0
((x-5/2)*(x-5))/((x+1)*(3*x-3)) = 0
((x-5/2)*(x-5))/((x+1)*(3*x-3)) = 0 // * (x+1)*(3*x-3)
(x-5/2)*(x-5) = 0
( x-5/2 )
x-5/2 = 0 // + 5/2
x = 5/2
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 5/2, 5 }
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