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n in (-oo:+oo)
-3 = (-1/2)*(n-6) // - (-1/2)*(n-6)
-((-1/2)*(n-6))-3 = 0
(1/2)*(n-6)-3 = 0
1/2*(n-6)-3 = 0
1/2*(n-6)-3 = 0
1/2*n-6 = 0
1/2*n-6 = 0
1/2*n-6 = 0 // + 6
1/2*n = 6 // : 1/2
n = 6/1/2
n = 12
n = 12
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