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n in (-oo:+oo)
10/7 = n/5 // - n/5
10/7-(n/5) = 0
10/7-1/5*n = 0 // - 10/7
-1/5*n = -10/7 // : -1/5
n = -10/7/(-1/5)
n = 50/7
n = 50/7
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