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(1/3)*(x-18) = 2/3 // - 2/3
(1/3)*(x-18)-(2/3) = 0
(1/3)*(x-18)-2/3 = 0
1/3*(x-18)-2/3 = 0
(1/3*3*(x-18))/3-2/3 = 0
1/3*3*(x-18)-2 = 0
x-20 = 0
(x-20)/3 = 0
(x-20)/3 = 0 // * 3
x-20 = 0
x-20 = 0 // + 20
x = 20
x = 20
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