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D( x )
x = 0
x+3 = 0
x = 0
x = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:0) U (0:+oo)
4/x+1/x-1+3 = (9/(x+3))*(x-1) // - (9/(x+3))*(x-1)
4/x-((9/(x+3))*(x-1))+1/x-1+3 = 0
4/x-9*(x-1)*(x+3)^-1+1/x-1+3 = 0
(-9*(x-1))/(x+3)+4/x+1/x-1+3 = 0
(-9*x*(x-1))/(x*(x+3))+(4*(x+3))/(x*(x+3))+(1*(x+3))/(x*(x+3))+(-1*x*(x+3))/(x*(x+3))+(3*x*(x+3))/(x*(x+3)) = 0
4*(x+3)-9*x*(x-1)+1*(x+3)-1*x*(x+3)+3*x*(x+3) = 0
3*x^2-9*x^2-x^2+13*x+x-3*x+9*x+3+12 = 0
3*x^2-9*x^2-x^2+14*x-3*x+9*x+15 = 0
3*x^2-10*x^2+11*x+9*x+15 = 0
20*x-7*x^2+15 = 0
20*x-7*x^2+15 = 0
20*x-7*x^2+15 = 0
DELTA = 20^2-(-7*4*15)
DELTA = 820
DELTA > 0
x = (820^(1/2)-20)/(-7*2) or x = (-820^(1/2)-20)/(-7*2)
x = (2*205^(1/2)-20)/(-14) or x = (-2*205^(1/2)-20)/(-14)
(x-((2*205^(1/2)-20)/(-14)))*(x-((-2*205^(1/2)-20)/(-14))) = 0
((x-((2*205^(1/2)-20)/(-14)))*(x-((-2*205^(1/2)-20)/(-14))))/(x*(x+3)) = 0
((x-((2*205^(1/2)-20)/(-14)))*(x-((-2*205^(1/2)-20)/(-14))))/(x*(x+3)) = 0 // * x*(x+3)
(x-((2*205^(1/2)-20)/(-14)))*(x-((-2*205^(1/2)-20)/(-14))) = 0
( x-((-2*205^(1/2)-20)/(-14)) )
x-((-2*205^(1/2)-20)/(-14)) = 0 // + (-2*205^(1/2)-20)/(-14)
x = (-2*205^(1/2)-20)/(-14)
( x-((2*205^(1/2)-20)/(-14)) )
x-((2*205^(1/2)-20)/(-14)) = 0 // + (2*205^(1/2)-20)/(-14)
x = (2*205^(1/2)-20)/(-14)
x in { (-2*205^(1/2)-20)/(-14), (2*205^(1/2)-20)/(-14) }
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