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(2/5)*(3*x-7) = 0
2/5*(3*x-7) = 0
( 2/5 )
2/5 = 0
x belongs to the empty set
( 3*x-7 )
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
x = 7/3
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