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p in (-oo:+oo)
(3/4)*(12*p-16) = 0
3/4*(12*p-16) = 0
( 12*p-16 )
12*p-16 = 0 // + 16
12*p = 16 // : 12
p = 16/12
p = 4/3
( 3/4 )
3/4 = 0
p belongs to the empty set
p = 4/3
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