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(2/3)*(3*x-12) = 10 // - 10
(2/3)*(3*x-12)-10 = 0
2/3*(3*x-12)-10 = 0
2/3*(3*x-12)-10 = 0
2*x-18 = 0
2*x-18 = 0
2*x-18 = 0 // + 18
2*x = 18 // : 2
x = 18/2
x = 9
x = 9
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