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(4/5)*(20*x-10) = 0
4/5*(20*x-10) = 0
( 20*x-10 )
20*x-10 = 0 // + 10
20*x = 10 // : 20
x = 10/20
x = 1/2
( 4/5 )
4/5 = 0
x belongs to the empty set
x = 1/2
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