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w in (-oo:+oo)
(1/4)*(2/5-((2/3)*w)) = 0
(1/4)*((-2/3)*w+2/5) = 0
1/4*(2/5-2/3*w) = 0
( 1/4 )
1/4 = 0
w belongs to the empty set
( 2/5-2/3*w )
2/5-2/3*w = 0 // - 2/5
-2/3*w = -2/5 // : -2/3
w = -2/5/(-2/3)
w = 3/5
w = 3/5
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