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n in (-oo:+oo)
1/7 = n/300000 // - n/300000
1/7-(n/300000) = 0
1/7-1/300000*n = 0 // - 1/7
-1/300000*n = -1/7 // : -1/300000
n = -1/7/(-1/300000)
n = 300000/7
n = 300000/7
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