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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:+oo)
7/(3*x+3) = 7/(x+1)-(2/3) // - 7/(x+1)-(2/3)
7/(3*x+3)-(7/(x+1))+2/3 = 0
7/(3*x+3)-7*(x+1)^-1+2/3 = 0
7/(3*x+3)-7/(x+1)+2/3 = 0
(3*7*(x+1))/(3*(3*x+3)*(x+1))+(-7*3*(3*x+3))/(3*(3*x+3)*(x+1))+(2*(3*x+3)*(x+1))/(3*(3*x+3)*(x+1)) = 0
3*7*(x+1)-7*3*(3*x+3)+2*(3*x+3)*(x+1) = 0
6*x^2-42*x+12*x-42+6 = 0
6*x^2-30*x-36 = 0
6*x^2-30*x-36 = 0
6*(x^2-5*x-6) = 0
x^2-5*x-6 = 0
DELTA = (-5)^2-(-6*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(1*2) or x = (5-49^(1/2))/(1*2)
x = 6 or x = -1
6*(x+1)*(x-6) = 0
(6*(x+1)*(x-6))/(3*(3*x+3)*(x+1)) = 0
(6*(x+1)*(x-6))/(3*(3*x+3)*(x+1)) = 0 // * 3*(3*x+3)*(x+1)
6*(x+1)*(x-6) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-6 )
x-6 = 0 // + 6
x = 6
x in { -1}
x = 6
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