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n in (-oo:+oo)
3/7-6*n = 243/77 // - 243/77
3/7-6*n-(243/77) = 0
3/7-6*n-243/77 = 0
-6*n-30/11 = 0 // + 30/11
-6*n = 30/11 // : -6
n = 30/11/(-6)
n = -5/11
n = -5/11
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