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4*x+1/3 = 2*x+5/3 // - 2*x+5/3
4*x-(2*x)+1/3-(5/3) = 0
4*x-2*x+1/3-5/3 = 0
2*x-4/3 = 0 // + 4/3
2*x = 4/3 // : 2
x = 4/3/2
x = 2/3
x = 2/3
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