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(3/8)*x = 9/4 // - 9/4
(3/8)*x-(9/4) = 0
(3/8)*x-9/4 = 0
3/8*x-9/4 = 0 // + 9/4
3/8*x = 9/4 // : 3/8
x = 9/4/3/8
x = 6
x = 6
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