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D( x )
x+2 = 0
x+1 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-2) U (-2:-1) U (-1:+oo)
(7*x-1)/(x+2)-((2*x+3)/(x+1))-4 = 0
(7*x-1)/(x+2)+(-1*(2*x+3))/(x+1)-4 = 0
((7*x-1)*(x+1))/((x+2)*(x+1))+(-1*(2*x+3)*(x+2))/((x+2)*(x+1))+(-4*(x+2)*(x+1))/((x+2)*(x+1)) = 0
(7*x-1)*(x+1)-1*(2*x+3)*(x+2)-4*(x+2)*(x+1) = 0
5*x^2-4*x^2-x-12*x-8-7 = 0
x^2-13*x-15 = 0
x^2-13*x-15 = 0
x^2-13*x-15 = 0
DELTA = (-13)^2-(-15*1*4)
DELTA = 229
DELTA > 0
x = (229^(1/2)+13)/(1*2) or x = (13-229^(1/2))/(1*2)
x = (229^(1/2)+13)/2 or x = (13-229^(1/2))/2
(x-((13-229^(1/2))/2))*(x-((229^(1/2)+13)/2)) = 0
((x-((13-229^(1/2))/2))*(x-((229^(1/2)+13)/2)))/((x+2)*(x+1)) = 0
((x-((13-229^(1/2))/2))*(x-((229^(1/2)+13)/2)))/((x+2)*(x+1)) = 0 // * (x+2)*(x+1)
(x-((13-229^(1/2))/2))*(x-((229^(1/2)+13)/2)) = 0
( x-((13-229^(1/2))/2) )
x-((13-229^(1/2))/2) = 0 // + (13-229^(1/2))/2
x = (13-229^(1/2))/2
( x-((229^(1/2)+13)/2) )
x-((229^(1/2)+13)/2) = 0 // + (229^(1/2)+13)/2
x = (229^(1/2)+13)/2
x in { (13-229^(1/2))/2, (229^(1/2)+13)/2 }
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