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n in (-oo:+oo)
6-7*n = 71/6 // - 71/6
6-7*n-(71/6) = 0
6-7*n-71/6 = 0
-7*n-35/6 = 0 // + 35/6
-7*n = 35/6 // : -7
n = 35/6/(-7)
n = -5/6
n = -5/6
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