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(1/3)*((6/10)*x-21) = 0
1/3*(3/5*x-21) = 0
( 1/3 )
1/3 = 0
x belongs to the empty set
( 3/5*x-21 )
3/5*x-21 = 0 // + 21
3/5*x = 21 // : 3/5
x = 21/3/5
x = 35
x = 35
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