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n in (-oo:+oo)
2/7 = n/28 // - n/28
2/7-(n/28) = 0
2/7-1/28*n = 0 // - 2/7
-1/28*n = -2/7 // : -1/28
n = -2/7/(-1/28)
n = 8
n = 8
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