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(3/8)*x+1/4 = 3/4 // - 3/4
(3/8)*x+1/4-(3/4) = 0
(3/8)*x+1/4-3/4 = 0
3/8*x-1/2 = 0 // + 1/2
3/8*x = 1/2 // : 3/8
x = 1/2/3/8
x = 4/3
x = 4/3
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