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3*((1/3)*x+2/3) = 7 // - 7
3*((1/3)*x+2/3)-7 = 0
3*(1/3*x+2/3)-7 = 0
3*(1/3*x+2/3)-7 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x = 5
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