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3*((2/3)*x-1) = 15 // - 15
3*((2/3)*x-1)-15 = 0
3*(2/3*x-1)-15 = 0
3*(2/3*x-1)-15 = 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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