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p in (-oo:+oo)
(5*p)/7-18 = -42 // + 42
(5*p)/7-18+42 = 0
5/7*p+24 = 0 // - 24
5/7*p = -24 // : 5/7
p = -24/5/7
p = -168/5
p = -168/5
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