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(1/7)*((1/9)*x-28) = 0
1/7*(1/9*x-28) = 0
( 1/7 )
1/7 = 0
x belongs to the empty set
( 1/9*x-28 )
1/9*x-28 = 0 // + 28
1/9*x = 28 // : 1/9
x = 28/1/9
x = 252
x = 252
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