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n in (-oo:+oo)
1/7 = 28*n // - 28*n
1/7-(28*n) = 0
1/7-28*n = 0
1/7-28*n = 0 // - 1/7
-28*n = -1/7 // : -28
n = -1/7/(-28)
n = 1/196
n = 1/196
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