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D( n )
4*n-28 = 0
4*n-28 = 0
4*n-28 = 0
4*n-28 = 0 // + 28
4*n = 28 // : 4
n = 28/4
n = 7
n in (-oo:7) U (7:+oo)
3/(4*n-28) = 2*n // - 2*n
3/(4*n-28)-(2*n) = 0
3/(4*n-28)-2*n = 0
3/(4*n-28)+(-2*n*(4*n-28))/(4*n-28) = 0
3-2*n*(4*n-28) = 0
56*n-8*n^2+3 = 0
56*n-8*n^2+3 = 0
56*n-8*n^2+3 = 0
DELTA = 56^2-(-8*3*4)
DELTA = 3232
DELTA > 0
n = (3232^(1/2)-56)/(-8*2) or n = (-3232^(1/2)-56)/(-8*2)
n = (4*202^(1/2)-56)/(-16) or n = (-4*202^(1/2)-56)/(-16)
(n-((4*202^(1/2)-56)/(-16)))*(n-((-4*202^(1/2)-56)/(-16))) = 0
((n-((4*202^(1/2)-56)/(-16)))*(n-((-4*202^(1/2)-56)/(-16))))/(4*n-28) = 0
((n-((4*202^(1/2)-56)/(-16)))*(n-((-4*202^(1/2)-56)/(-16))))/(4*n-28) = 0 // * 4*n-28
(n-((4*202^(1/2)-56)/(-16)))*(n-((-4*202^(1/2)-56)/(-16))) = 0
( n-((-4*202^(1/2)-56)/(-16)) )
n-((-4*202^(1/2)-56)/(-16)) = 0 // + (-4*202^(1/2)-56)/(-16)
n = (-4*202^(1/2)-56)/(-16)
( n-((4*202^(1/2)-56)/(-16)) )
n-((4*202^(1/2)-56)/(-16)) = 0 // + (4*202^(1/2)-56)/(-16)
n = (4*202^(1/2)-56)/(-16)
n in { (-4*202^(1/2)-56)/(-16), (4*202^(1/2)-56)/(-16) }
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