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x in (-oo:+oo)
(1/3)*(3*x-12) = 0
1/3*(3*x-12) = 0
( 1/3 )
1/3 = 0
x belongs to the empty set
( 3*x-12 )
3*x-12 = 0 // + 12
3*x = 12 // : 3
x = 12/3
x = 4
x = 4
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