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