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n in (-oo:+oo)
8 = (12/7)*n // - (12/7)*n
8-((12/7)*n) = 0
(-12/7)*n+8 = 0
8-12/7*n = 0 // - 8
-12/7*n = -8 // : -12/7
n = -8/(-12/7)
n = 14/3
n = 14/3
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