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p in (-oo:+oo)
(-3/4)*(8*p-12) = 0
-3/4*(8*p-12) = 0
( -3/4 )
-3/4 = 0
p belongs to the empty set
( 8*p-12 )
8*p-12 = 0 // + 12
8*p = 12 // : 8
p = 12/8
p = 3/2
p = 3/2
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