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n in (-oo:+oo)
6/7 = n/49 // - n/49
6/7-(n/49) = 0
6/7-1/49*n = 0 // - 6/7
-1/49*n = -6/7 // : -1/49
n = -6/7/(-1/49)
n = 42
n = 42
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