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n in (-oo:+oo)
15-((1/6)*n) = 1-(6*n)-1 // - 1-(6*n)-1
6*n-((1/6)*n)-1+1+15 = 0
(-1/6)*n+6*n-1+1+15 = 0
35/6*n+15 = 0 // - 15
35/6*n = -15 // : 35/6
n = -15/35/6
n = -18/7
n = -18/7
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