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p in (-oo:+oo)
(2*p)/5-(p/3) = 7/5 // - 7/5
(2*p)/5-(p/3)-(7/5) = 0
(2*p)/5-(p/3)-7/5 = 0
1/15*p-7/5 = 0 // + 7/5
1/15*p = 7/5 // : 1/15
p = 7/5/1/15
p = 21
p = 21
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