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12*((1/3)*x-(3/4)) = 0
12*((1/3)*x-3/4) = 0
12*(1/3*x-3/4) = 0
( 1/3*x-3/4 )
1/3*x-3/4 = 0 // + 3/4
1/3*x = 3/4 // : 1/3
x = 3/4/1/3
x = 9/4
( 12 )
12 = 0
x belongs to the empty set
x = 9/4
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