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(2/5)*(4*x-7) = 0
2/5*(4*x-7) = 0
( 2/5 )
2/5 = 0
x belongs to the empty set
( 4*x-7 )
4*x-7 = 0 // + 7
4*x = 7 // : 4
x = 7/4
x = 7/4
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