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n in (-oo:+oo)
6 = (2/7)*n // - (2/7)*n
6-((2/7)*n) = 0
(-2/7)*n+6 = 0
6-2/7*n = 0 // - 6
-2/7*n = -6 // : -2/7
n = -6/(-2/7)
n = 21
n = 21
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