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