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