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3*x-(1/5) = 104/5 // - 104/5
3*x-(1/5)-(104/5) = 0
3*x-1/5-104/5 = 0
3*x-21 = 0 // + 21
3*x = 21 // : 3
x = 21/3
x = 7
x = 7
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