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(3/4)*((1/2)*x-12) = 0
3/4*(1/2*x-12) = 0
( 1/2*x-12 )
1/2*x-12 = 0 // + 12
1/2*x = 12 // : 1/2
x = 12/1/2
x = 24
( 3/4 )
3/4 = 0
x belongs to the empty set
x = 24
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