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2*x-((1/3)*x)-(2/3) = 13 // - 13
2*x-((1/3)*x)-(2/3)-13 = 0
2*x+(-1/3)*x-2/3-13 = 0
5/3*x-41/3 = 0 // + 41/3
5/3*x = 41/3 // : 5/3
x = 41/3/5/3
x = 41/5
x = 41/5
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