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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 = 0
-n/2 = 0
-n/2 = 0 // * 2
-n = 0
-1*n = 0 // : -1
n = 0
n = 0
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