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(1/3)*(2*x-8) = 4 // - 4
(1/3)*(2*x-8)-4 = 0
1/3*(2*x-8)-4 = 0
1/3*(2*x-8)-4 = 0
2/3*x-20/3 = 0
2/3*x-20/3 = 0
2/3*x-20/3 = 0 // + 20/3
2/3*x = 20/3 // : 2/3
x = 20/3/2/3
x = 10
x = 10
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