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D( x )
x+4 = 0
x = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x = 0
x = 0
x in (-oo:-4) U (-4:0) U (0:+oo)
1/(x+4)+1/x = 1/3 // - 1/3
1/(x+4)+1/x-(1/3) = 0
1/(x+4)+1/x-1/3 = 0
(1*3*x)/(3*x*(x+4))+(1*3*(x+4))/(3*x*(x+4))+(-1*x*(x+4))/(3*x*(x+4)) = 0
1*3*(x+4)-1*x*(x+4)+1*3*x = 0
6*x-x^2-4*x+12 = 0
2*x-x^2+12 = 0
2*x-x^2+12 = 0
2*x-x^2+12 = 0
DELTA = 2^2-(-1*4*12)
DELTA = 52
DELTA > 0
x = (52^(1/2)-2)/(-1*2) or x = (-52^(1/2)-2)/(-1*2)
x = (2*13^(1/2)-2)/(-2) or x = (-2*13^(1/2)-2)/(-2)
(x-((2*13^(1/2)-2)/(-2)))*(x-((-2*13^(1/2)-2)/(-2))) = 0
((x-((2*13^(1/2)-2)/(-2)))*(x-((-2*13^(1/2)-2)/(-2))))/(3*x*(x+4)) = 0
((x-((2*13^(1/2)-2)/(-2)))*(x-((-2*13^(1/2)-2)/(-2))))/(3*x*(x+4)) = 0 // * 3*x*(x+4)
(x-((2*13^(1/2)-2)/(-2)))*(x-((-2*13^(1/2)-2)/(-2))) = 0
( x-((-2*13^(1/2)-2)/(-2)) )
x-((-2*13^(1/2)-2)/(-2)) = 0 // + (-2*13^(1/2)-2)/(-2)
x = (-2*13^(1/2)-2)/(-2)
( x-((2*13^(1/2)-2)/(-2)) )
x-((2*13^(1/2)-2)/(-2)) = 0 // + (2*13^(1/2)-2)/(-2)
x = (2*13^(1/2)-2)/(-2)
x in { (-2*13^(1/2)-2)/(-2), (2*13^(1/2)-2)/(-2) }
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