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p in (-oo:+oo)
19 = (1/3)*p // - (1/3)*p
19-((1/3)*p) = 0
(-1/3)*p+19 = 0
19-1/3*p = 0 // - 19
-1/3*p = -19 // : -1/3
p = -19/(-1/3)
p = 57
p = 57
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