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p in (-oo:+oo)
-12 = (3*p)/7 // - (3*p)/7
-((3*p)/7)-12 = 0
(-3/7)*p-12 = 0
-3/7*p-12 = 0 // + 12
-3/7*p = 12 // : -3/7
p = 12/(-3/7)
p = -28
p = -28
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