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n in (-oo:+oo)
n/(-7) = -2/3 // + -2/3
n/(-7)-(-2/3) = 0
n/(-7)+2/3 = 0
2/3-1/7*n = 0 // - 2/3
-1/7*n = -2/3 // : -1/7
n = -2/3/(-1/7)
n = 14/3
n = 14/3
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