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n in (-oo:+oo)
-((n^2-(11*n))/14) = 2 // - 2
-((n^2-(11*n))/14)-2 = 0
-((n^2-11*n)/14)-2 = 0
(-1*(n^2-11*n))/14-2 = 0
(-1*(n^2-11*n))/14+(-2*14)/14 = 0
-1*(n^2-11*n)-2*14 = 0
11*n-n^2-28 = 0
11*n-n^2-28 = 0
11*n-n^2-28 = 0
DELTA = 11^2-(-28*(-1)*4)
DELTA = 9
DELTA > 0
n = (9^(1/2)-11)/(-1*2) or n = (-9^(1/2)-11)/(-1*2)
n = 4 or n = 7
(n-4)*(n-7) = 0
((n-4)*(n-7))/14 = 0
((n-4)*(n-7))/14 = 0 // * 14
(n-4)*(n-7) = 0
( n-4 )
n-4 = 0 // + 4
n = 4
( n-7 )
n-7 = 0 // + 7
n = 7
n in { 4, 7 }
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