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D( n )
8*n-((10/9)*n)-12 = 0
8*n-((10/9)*n)-12 = 0
8*n-((10/9)*n)-12 = 0
8*n+(-10/9)*n-12 = 0
62/9*n-12 = 0 // + 12
62/9*n = 12 // : 62/9
n = 12/62/9
n = 54/31
n in (-oo:54/31) U (54/31:+oo)
(2*n-(3*n)+12/4)/(8*n-((10/9)*n)-12) = 0
(2*n-3*n+12/4)/(8*n+(-10/9)*n-12) = 0
(3-n)/(62/9*n-12) = 0
3-n = 0 // - 3
-n = -3 // * -1
n = 3
n = 3
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