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6*x-(12/8) = 9 // - 9
6*x-(12/8)-9 = 0
6*x-3/2-9 = 0
6*x-21/2 = 0 // + 21/2
6*x = 21/2 // : 6
x = 21/2/6
x = 7/4
x = 7/4
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