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p in (-oo:+oo)
-2 = p/3+5 // - p/3+5
-(p/3)-5-2 = 0
-1/3*p-7 = 0 // + 7
-1/3*p = 7 // : -1/3
p = 7/(-1/3)
p = -21
p = -21
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