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p in (-oo:+oo)
(5/7)*p-((2/7)*p)+12 = 6 // - 6
(5/7)*p-((2/7)*p)-6+12 = 0
(5/7)*p+(-2/7)*p-6+12 = 0
3/7*p+6 = 0 // - 6
3/7*p = -6 // : 3/7
p = -6/3/7
p = -14
p = -14
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