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w in (-oo:+oo)
12*(2/3-(2*w)) = 0
12*(2/3-2*w) = 0
( 12 )
12 = 0
w belongs to the empty set
( 2/3-2*w )
2/3-2*w = 0 // - 2/3
-2*w = -2/3 // : -2
w = -2/3/(-2)
w = 1/3
w = 1/3
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