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p in (-oo:+oo)
((-2*1)/7)*p = -3 // + 3
((-2*1)/7)*p+3 = 0
(-2/7)*p+3 = 0
3-2/7*p = 0 // - 3
-2/7*p = -3 // : -2/7
p = -3/(-2/7)
p = 21/2
p = 21/2
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