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(2/3)*(2*x-2) = 20 // - 20
(2/3)*(2*x-2)-20 = 0
2/3*(2*x-2)-20 = 0
2/3*(2*x-2)-20 = 0
4/3*x-64/3 = 0
4/3*x-64/3 = 0
4/3*x-64/3 = 0 // + 64/3
4/3*x = 64/3 // : 4/3
x = 64/3/4/3
x = 16
x = 16
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