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(1/5)*(25*x-5) = 0
1/5*(25*x-5) = 0
( 1/5 )
1/5 = 0
x belongs to the empty set
( 25*x-5 )
25*x-5 = 0 // + 5
25*x = 5 // : 25
x = 5/25
x = 1/5
x = 1/5
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