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n in (-oo:+oo)
7*n-((3/7)*n)-(5/6) = 1345/42 // - 1345/42
7*n-((3/7)*n)-(5/6)-(1345/42) = 0
7*n+(-3/7)*n-5/6-1345/42 = 0
46/7*n-230/7 = 0 // + 230/7
46/7*n = 230/7 // : 46/7
n = 230/7/46/7
n = 5
n = 5
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