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n in (-oo:+oo)
-((-1/2)*n)-6 = 8 // - 8
-((-1/2)*n)-8-6 = 0
(1/2)*n-8-6 = 0
1/2*n-14 = 0 // + 14
1/2*n = 14 // : 1/2
n = 14/1/2
n = 28
n = 28
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