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9*x-(3*(1/4)) = 12 // - 12
9*x-(3*(1/4))-12 = 0
9*x-3/4-12 = 0
9*x-51/4 = 0 // + 51/4
9*x = 51/4 // : 9
x = 51/4/9
x = 17/12
x = 17/12
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