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n in (-oo:+oo)
-6 = (3/7)*n // - (3/7)*n
-((3/7)*n)-6 = 0
(-3/7)*n-6 = 0
-3/7*n-6 = 0 // + 6
-3/7*n = 6 // : -3/7
n = 6/(-3/7)
n = -14
n = -14
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