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5*x+2/3 = 4-(2*x) // - 4-(2*x)
5*x+2*x+2/3-4 = 0
7*x-10/3 = 0 // + 10/3
7*x = 10/3 // : 7
x = 10/3/7
x = 10/21
x = 10/21
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