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n in (-oo:+oo)
50/70 = n/7 // - n/7
50/70-(n/7) = 0
5/7-1/7*n = 0 // - 5/7
-1/7*n = -5/7 // : -1/7
n = -5/7/(-1/7)
n = 5
n = 5
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