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n in (-oo:+oo)
(1/2)*(6*n-2) = 19-5*n // - 19-5*n
(1/2)*(6*n-2)-(-5*n)-19 = 0
(1/2)*(6*n-2)+5*n-19 = 0
1/2*(6*n-2)+5*n-19 = 0
1/2*(6*n-2)+5*n-19 = 0
8*n-19-1 = 0
8*n-20 = 0
8*n-20 = 0
8*n-20 = 0 // + 20
8*n = 20 // : 8
n = 20/8
n = 5/2
n = 5/2
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