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x+2*x-(3/3)-(1/6) = 4 // - 4
x+2*x-(3/3)-(1/6)-4 = 0
x+2*x-1/6-4-1 = 0
3*x-31/6 = 0 // + 31/6
3*x = 31/6 // : 3
x = 31/6/3
x = 31/18
x = 31/18
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