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4*x-(4/3) = 12 // - 12
4*x-(4/3)-12 = 0
4*x-4/3-12 = 0
4*x-40/3 = 0 // + 40/3
4*x = 40/3 // : 4
x = 40/3/4
x = 10/3
x = 10/3
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