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(3*x)/4 = 81/12 // - 81/12
(3*x)/4-(81/12) = 0
(3*x)/4-27/4 = 0
3/4*x-27/4 = 0 // + 27/4
3/4*x = 27/4 // : 3/4
x = 27/4/3/4
x = 9
x = 9
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