у - 7/12у = 4 1/6
5/12у = 25/6
у = 25/6 : 5/12
у = 25/6 * 12/5
у = 10
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у - 7/12у = 4 1/6
5/12у = 25/6
у = 25/6 : 5/12
у = 25/6 * 12/5
у = 10