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4*(4*x-(14/5))^2 = 0
4*(4*x-14/5)^2 = 0
( 4*x-14/5 )
4*x-14/5 = 0 // + 14/5
4*x = 14/5 // : 4
x = 14/5/4
x = 7/10
( 4 )
4 = 0
x belongs to the empty set
x in { 7/10, 7/10 }
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