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x in (-oo:+oo)
(1/2-x)*(4/3-(3*x)) = 0
(1/2-x)*(4/3-3*x) = 0
( 1/2-x )
1/2-x = 0 // - 1/2
-x = -1/2 // * -1
x = 1/2
( 4/3-3*x )
4/3-3*x = 0 // - 4/3
-3*x = -4/3 // : -3
x = -4/3/(-3)
x = 4/9
x in { 1/2, 4/9 }
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