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p in (-oo:+oo)
-7/3 = p/21 // - p/21
-(p/21)-7/3 = 0
-1/21*p-7/3 = 0 // + 7/3
-1/21*p = 7/3 // : -1/21
p = 7/3/(-1/21)
p = -49
p = -49
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