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b in (-oo:+oo)
(-2/6)*((1/2)*b-(1/8)) = 0
(-2/6)*((1/2)*b-1/8) = 0
-1/3*(1/2*b-1/8) = 0
( -1/3 )
-1/3 = 0
b belongs to the empty set
( 1/2*b-1/8 )
1/2*b-1/8 = 0 // + 1/8
1/2*b = 1/8 // : 1/2
b = 1/8/1/2
b = 1/4
b = 1/4
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