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p in (-oo:+oo)
(-5/3)*p+1/3+1 = 23/21 // - 23/21
(-5/3)*p+1/3-(23/21)+1 = 0
(-5/3)*p+1/3-23/21+1 = 0
5/21-5/3*p = 0 // - 5/21
-5/3*p = -5/21 // : -5/3
p = -5/21/(-5/3)
p = 1/7
p = 1/7
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