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(1/3)*(9*x-15) = 13 // - 13
(1/3)*(9*x-15)-13 = 0
1/3*(9*x-15)-13 = 0
1/3*(9*x-15)-13 = 0
3*x-18 = 0
3*x-18 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x = 6
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