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(5/8)*x-4 = 3/8 // - 3/8
(5/8)*x-(3/8)-4 = 0
(5/8)*x-3/8-4 = 0
5/8*x-35/8 = 0 // + 35/8
5/8*x = 35/8 // : 5/8
x = 35/8/5/8
x = 7
x = 7
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