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3*x+x+45/7+6/4 = 12 // - 12
3*x+x+45/7+6/4-12 = 0
4*x-57/14 = 0 // + 57/14
4*x = 57/14 // : 4
x = 57/14/4
x = 57/56
x = 57/56
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