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3*x+x+23/4+39/6 = 15 // - 15
3*x+x+23/4+39/6-15 = 0
4*x-11/4 = 0 // + 11/4
4*x = 11/4 // : 4
x = 11/4/4
x = 11/16
x = 11/16
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