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p in (-oo:+oo)
((3/7)*p+(1/3)*p)*((4/7)*p-((8/3)*p)) = 0
((3/7)*p+(1/3)*p)*((4/7)*p+(-8/3)*p) = 0
-44/21*16/21*p*p = 0
( -44/21*p )
-44/21*p = 0 // : -44/21
p = 0
( 16/21*p )
16/21*p = 0 // : 16/21
p = 0
p in { 0, 0 }
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