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(2*x+2/3)*(1/4-(2*x)) = 0
(2*x+2/3)*(1/4-2*x) = 0
( 1/4-2*x )
1/4-2*x = 0 // - 1/4
-2*x = -1/4 // : -2
x = -1/4/(-2)
x = 1/8
( 2*x+2/3 )
2*x+2/3 = 0 // - 2/3
2*x = -2/3 // : 2
x = -2/3/2
x = -1/3
x in { 1/8, -1/3 }
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