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p in (-oo:+oo)
(5/7)*p-((2/7)*p)+13 = 6 // - 6
(5/7)*p-((2/7)*p)-6+13 = 0
(5/7)*p+(-2/7)*p-6+13 = 0
3/7*p+7 = 0 // - 7
3/7*p = -7 // : 3/7
p = -7/3/7
p = -49/3
p = -49/3
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