Ответы на вопрос:
(6 6/5 - 3у) - 5 1/21 = 11/4 ( 36/5 - 3у) - 106/21 = 11/4 36/5 - 3у = 11/4 + 106/21 36/5 - 3у = 11*21/84 + 424/84 36/5 - 3у = 231/84 + 424/84 36/5 - 3у = 655/84 3у = 36/5 - 655/84 3у = 36 * 84/420 - 3275/420 3у = 3024/420 -3275/420 3у = - 251/420 у = - 251/420 : 3 у = - 251/ 1260
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