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w in (-oo:+oo)
(1/4)*(12*w-5) = 0
1/4*(12*w-5) = 0
( 1/4 )
1/4 = 0
w belongs to the empty set
( 12*w-5 )
12*w-5 = 0 // + 5
12*w = 5 // : 12
w = 5/12
w = 5/12
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