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(3/4)*(20*x-8) = 0
3/4*(20*x-8) = 0
( 20*x-8 )
20*x-8 = 0 // + 8
20*x = 8 // : 20
x = 8/20
x = 2/5
( 3/4 )
3/4 = 0
x belongs to the empty set
x = 2/5
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