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(5/8)*x = 4/7 // - 4/7
(5/8)*x-(4/7) = 0
(5/8)*x-4/7 = 0
5/8*x-4/7 = 0 // + 4/7
5/8*x = 4/7 // : 5/8
x = 4/7/5/8
x = 32/35
x = 32/35
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