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(3/4)*(7*x-15) = 0
3/4*(7*x-15) = 0
( 3/4 )
3/4 = 0
x belongs to the empty set
( 7*x-15 )
7*x-15 = 0 // + 15
7*x = 15 // : 7
x = 15/7
x = 15/7
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