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(1/3)*(x-9) = 2/3 // - 2/3
(1/3)*(x-9)-(2/3) = 0
(1/3)*(x-9)-2/3 = 0
1/3*(x-9)-2/3 = 0
(1/3*3*(x-9))/3-2/3 = 0
1/3*3*(x-9)-2 = 0
x-11 = 0
(x-11)/3 = 0
(x-11)/3 = 0 // * 3
x-11 = 0
x-11 = 0 // + 11
x = 11
x = 11
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