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w in (-oo:+oo)
(2/5)*(10*w-15) = 0
2/5*(10*w-15) = 0
( 10*w-15 )
10*w-15 = 0 // + 15
10*w = 15 // : 10
w = 15/10
w = 3/2
( 2/5 )
2/5 = 0
w belongs to the empty set
w = 3/2
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