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(1/7)*(5*x-14) = 0
1/7*(5*x-14) = 0
( 1/7 )
1/7 = 0
x belongs to the empty set
( 5*x-14 )
5*x-14 = 0 // + 14
5*x = 14 // : 5
x = 14/5
x = 14/5
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