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7*((2/25)*x-(4/7)) = 0
7*((2/25)*x-4/7) = 0
7*(2/25*x-4/7) = 0
( 2/25*x-4/7 )
2/25*x-4/7 = 0 // + 4/7
2/25*x = 4/7 // : 2/25
x = 4/7/2/25
x = 50/7
( 7 )
7 = 0
x belongs to the empty set
x = 50/7
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