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3*x+x+26/7+29/4 = 13 // - 13
3*x+x+26/7+29/4-13 = 0
4*x-57/28 = 0 // + 57/28
4*x = 57/28 // : 4
x = 57/28/4
x = 57/112
x = 57/112
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