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(3/4)*(8*x-12) = 21 // - 21
(3/4)*(8*x-12)-21 = 0
3/4*(8*x-12)-21 = 0
3/4*(8*x-12)-21 = 0
6*x-30 = 0
6*x-30 = 0
6*x-30 = 0 // + 30
6*x = 30 // : 6
x = 30/6
x = 5
x = 5
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