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7*(7*x-(42/5)) = 0
7*(7*x-42/5) = 0
( 7*x-42/5 )
7*x-42/5 = 0 // + 42/5
7*x = 42/5 // : 7
x = 42/5/7
x = 6/5
( 7 )
7 = 0
x belongs to the empty set
x = 6/5
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