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(1/5)*(5*x-15) = 0
1/5*(5*x-15) = 0
( 1/5 )
1/5 = 0
x belongs to the empty set
( 5*x-15 )
5*x-15 = 0 // + 15
5*x = 15 // : 5
x = 15/5
x = 3
x = 3
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