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p in (-oo:+oo)
6/7 = p/42 // - p/42
6/7-(p/42) = 0
6/7-1/42*p = 0 // - 6/7
-1/42*p = -6/7 // : -1/42
p = -6/7/(-1/42)
p = 36
p = 36
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