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(5/7)*x+4/5 = 461/420 // - 461/420
(5/7)*x+4/5-(461/420) = 0
(5/7)*x+4/5-461/420 = 0
5/7*x-25/84 = 0 // + 25/84
5/7*x = 25/84 // : 5/7
x = 25/84/5/7
x = 5/12
x = 5/12
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