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12*x-(45/3) = 9*(2-x) // - 9*(2-x)
12*x-(9*(2-x))-(45/3) = 0
12*x-9*(2-x)-15 = 0
12*x-9*(2-x)-15 = 0
21*x-18-15 = 0
21*x-33 = 0
21*x-33 = 0
21*x-33 = 0 // + 33
21*x = 33 // : 21
x = 33/21
x = 11/7
x = 11/7
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