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(1/3)*(9*x-30) = 0
1/3*(9*x-30) = 0
( 1/3 )
1/3 = 0
x belongs to the empty set
( 9*x-30 )
9*x-30 = 0 // + 30
9*x = 30 // : 9
x = 30/9
x = 10/3
x = 10/3
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