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3*x+2/7 = 85/28 // - 85/28
3*x+2/7-(85/28) = 0
3*x+2/7-85/28 = 0
3*x-11/4 = 0 // + 11/4
3*x = 11/4 // : 3
x = 11/4/3
x = 11/12
x = 11/12
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