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D( x )
x+3 = 0
6*x+5 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
6*x+5 = 0
6*x+5 = 0
6*x+5 = 0 // - 5
6*x = -5 // : 6
x = -5/6
x in (-oo:-3) U (-3:-5/6) U (-5/6:+oo)
(x-1)/(6*x+5) = 4/(x+3) // - 4/(x+3)
(x-1)/(6*x+5)-(4/(x+3)) = 0
(x-1)/(6*x+5)-4*(x+3)^-1 = 0
(x-1)/(6*x+5)-4/(x+3) = 0
((x-1)*(x+3))/((6*x+5)*(x+3))+(-4*(6*x+5))/((6*x+5)*(x+3)) = 0
(x-1)*(x+3)-4*(6*x+5) = 0
x^2-22*x-23 = 0
x^2-22*x-23 = 0
x^2-22*x-23 = 0
DELTA = (-22)^2-(-23*1*4)
DELTA = 576
DELTA > 0
x = (576^(1/2)+22)/(1*2) or x = (22-576^(1/2))/(1*2)
x = 23 or x = -1
(x+1)*(x-23) = 0
((x+1)*(x-23))/((6*x+5)*(x+3)) = 0
((x+1)*(x-23))/((6*x+5)*(x+3)) = 0 // * (6*x+5)*(x+3)
(x+1)*(x-23) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-23 )
x-23 = 0 // + 23
x = 23
x in { -1, 23 }
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