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X in (-oo:+oo)
(2/3)*((1/2)*X-5) = 0
2/3*(1/2*X-5) = 0
( 1/2*X-5 )
1/2*X-5 = 0 // + 5
1/2*X = 5 // : 1/2
X = 5/1/2
X = 10
( 2/3 )
2/3 = 0
X belongs to the empty set
X = 10
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