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3*x+x-(7/9) = 3*x+7/3+3 // - 3*x+7/3+3
3*x+x-(3*x)-(7/9)-(7/3)-3 = 0
3*x+x-3*x-7/9-7/3-3 = 0
x-55/9 = 0 // + 55/9
x = 55/9
x = 55/9
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