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x in (-oo:+oo)
(-1/2)*(6*x-12) = 0
-1/2*(6*x-12) = 0
( -1/2 )
-1/2 = 0
x belongs to the empty set
( 6*x-12 )
6*x-12 = 0 // + 12
6*x = 12 // : 6
x = 12/6
x = 2
x = 2
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