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(3/8)*x+3/4 = 9/8 // - 9/8
(3/8)*x+3/4-(9/8) = 0
(3/8)*x+3/4-9/8 = 0
3/8*x-3/8 = 0 // + 3/8
3/8*x = 3/8 // : 3/8
x = 3/8/3/8
x = 1
x = 1
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