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(3/8)*((1/7)*x-16) = 0
3/8*(1/7*x-16) = 0
( 1/7*x-16 )
1/7*x-16 = 0 // + 16
1/7*x = 16 // : 1/7
x = 16/1/7
x = 112
( 3/8 )
3/8 = 0
x belongs to the empty set
x = 112
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