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p in (-oo:+oo)
p/7 = 9/14 // - 9/14
p/7-(9/14) = 0
p/7-9/14 = 0
1/7*p-9/14 = 0 // + 9/14
1/7*p = 9/14 // : 1/7
p = 9/14/1/7
p = 9/2
p = 9/2
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