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p in (-oo:+oo)
(2/5)*p = 3/7 // - 3/7
(2/5)*p-(3/7) = 0
(2/5)*p-3/7 = 0
2/5*p-3/7 = 0 // + 3/7
2/5*p = 3/7 // : 2/5
p = 3/7/2/5
p = 15/14
p = 15/14
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