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p in (-oo:+oo)
(5*p)/7-(90/7) = -10 // + 10
(5*p)/7-(90/7)+10 = 0
(5*p)/7-90/7+10 = 0
5/7*p-20/7 = 0 // + 20/7
5/7*p = 20/7 // : 5/7
p = 20/7/5/7
p = 4
p = 4
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