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(1/3)*(9*x-36) = 9 // - 9
(1/3)*(9*x-36)-9 = 0
1/3*(9*x-36)-9 = 0
1/3*(9*x-36)-9 = 0
3*x-21 = 0
3*x-21 = 0
3*x-21 = 0 // + 21
3*x = 21 // : 3
x = 21/3
x = 7
x = 7
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