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w in (-oo:+oo)
(-7/3)*(3*w-2) = 0
-7/3*(3*w-2) = 0
( -7/3 )
-7/3 = 0
w belongs to the empty set
( 3*w-2 )
3*w-2 = 0 // + 2
3*w = 2 // : 3
w = 2/3
w = 2/3
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