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9*x-(5/4) = 12 // - 12
9*x-(5/4)-12 = 0
9*x-5/4-12 = 0
9*x-53/4 = 0 // + 53/4
9*x = 53/4 // : 9
x = 53/4/9
x = 53/36
x = 53/36
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