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2*x+x+12/3-(12/4) = 13/2 // - 13/2
2*x+x+12/3-(12/4)-(13/2) = 0
2*x+x+12/3-13/2-3 = 0
3*x-11/2 = 0 // + 11/2
3*x = 11/2 // : 3
x = 11/2/3
x = 11/6
x = 11/6
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