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(2/3)*(12*x-15) = 0
2/3*(12*x-15) = 0
( 12*x-15 )
12*x-15 = 0 // + 15
12*x = 15 // : 12
x = 15/12
x = 5/4
( 2/3 )
2/3 = 0
x belongs to the empty set
x = 5/4
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