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3*x+(2/5)*x-1 = 11/14 // - 11/14
3*x+(2/5)*x-(11/14)-1 = 0
3*x+(2/5)*x-11/14-1 = 0
17/5*x-25/14 = 0 // + 25/14
17/5*x = 25/14 // : 17/5
x = 25/14/17/5
x = 125/238
x = 125/238
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