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x in (-oo:+oo)
2*(3-((1/3)*x)) = 0
2*((-1/3)*x+3) = 0
2*(3-1/3*x) = 0
( 2 )
2 = 0
x belongs to the empty set
( 3-1/3*x )
3-1/3*x = 0 // - 3
-1/3*x = -3 // : -1/3
x = -3/(-1/3)
x = 9
x = 9
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