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(1/3)*(x-9) = 18 // - 18
(1/3)*(x-9)-18 = 0
1/3*(x-9)-18 = 0
1/3*(x-9)-18 = 0
1/3*x-21 = 0
1/3*x-21 = 0
1/3*x-21 = 0 // + 21
1/3*x = 21 // : 1/3
x = 21/1/3
x = 63
x = 63
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