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(1/3)*(2*x-8) = 40 // - 40
(1/3)*(2*x-8)-40 = 0
1/3*(2*x-8)-40 = 0
1/3*(2*x-8)-40 = 0
2/3*x-128/3 = 0
2/3*x-128/3 = 0
2/3*x-128/3 = 0 // + 128/3
2/3*x = 128/3 // : 2/3
x = 128/3/2/3
x = 64
x = 64
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