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(3*x)/9 = 3*(x-9) // - 3*(x-9)
(3*x)/9-(3*(x-9)) = 0
(3*x)/9-3*(x-9) = 0
x/3-3*(x-9) = 0
(-3*3*(x-9))/3+x/3 = 0
x-3*3*(x-9) = 0
81-8*x = 0
(81-8*x)/3 = 0
(81-8*x)/3 = 0 // * 3
81-8*x = 0
81-8*x = 0 // - 81
-8*x = -81 // : -8
x = -81/(-8)
x = 81/8
x = 81/8
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