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(3/5)*(30*x-15) = 0
3/5*(30*x-15) = 0
( 3/5 )
3/5 = 0
x belongs to the empty set
( 30*x-15 )
30*x-15 = 0 // + 15
30*x = 15 // : 30
x = 15/30
x = 1/2
x = 1/2
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