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3*x+1/3 = 109/3 // - 109/3
3*x+1/3-(109/3) = 0
3*x+1/3-109/3 = 0
3*x-36 = 0 // + 36
3*x = 36 // : 3
x = 36/3
x = 12
x = 12
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