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x in (-oo:+oo)
(1/2)*(2*x-6) = 0
1/2*(2*x-6) = 0
( 1/2 )
1/2 = 0
x belongs to the empty set
( 2*x-6 )
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x = 3
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