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n in (-oo:+oo)
2*n-((2*n)/7)+7 = 1/18 // - 1/18
2*n-((2*n)/7)-(1/18)+7 = 0
(-2/7)*n+2*n-1/18+7 = 0
12/7*n+125/18 = 0 // - 125/18
12/7*n = -125/18 // : 12/7
n = -125/18/12/7
n = -875/216
n = -875/216
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