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