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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)
7/8-(1/x) = 1/(x+4) // - 1/(x+4)
7/8-(1/(x+4))-(1/x) = 0
7/8-(x+4)^-1-x^-1 = 0
7/8-1/(x+4)-1/x = 0
(-1*8*x)/(8*x*(x+4))+(-1*8*(x+4))/(8*x*(x+4))+(7*x*(x+4))/(8*x*(x+4)) = 0
7*x*(x+4)-1*8*(x+4)-1*8*x = 0
7*x^2-16*x+28*x-32 = 0
7*x^2+12*x-32 = 0
7*x^2+12*x-32 = 0
7*x^2+12*x-32 = 0
DELTA = 12^2-(-32*4*7)
DELTA = 1040
DELTA > 0
x = (1040^(1/2)-12)/(2*7) or x = (-1040^(1/2)-12)/(2*7)
x = (4*65^(1/2)-12)/14 or x = (-4*65^(1/2)-12)/14
(x-((-4*65^(1/2)-12)/14))*(x-((4*65^(1/2)-12)/14)) = 0
((x-((-4*65^(1/2)-12)/14))*(x-((4*65^(1/2)-12)/14)))/(8*x*(x+4)) = 0
((x-((-4*65^(1/2)-12)/14))*(x-((4*65^(1/2)-12)/14)))/(8*x*(x+4)) = 0 // * 8*x*(x+4)
(x-((-4*65^(1/2)-12)/14))*(x-((4*65^(1/2)-12)/14)) = 0
( x-((-4*65^(1/2)-12)/14) )
x-((-4*65^(1/2)-12)/14) = 0 // + (-4*65^(1/2)-12)/14
x = (-4*65^(1/2)-12)/14
( x-((4*65^(1/2)-12)/14) )
x-((4*65^(1/2)-12)/14) = 0 // + (4*65^(1/2)-12)/14
x = (4*65^(1/2)-12)/14
x in { (-4*65^(1/2)-12)/14, (4*65^(1/2)-12)/14 }
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