Умоляю помогите пожалуйста!!!!!!!!!!! решить уравнения: (2/3х-4/5)×15=8
2/3х+7/3х= 18
(5/7-2/3у)×21=1
7/12m+2/3m-1/4m=7
Срочно!!!!!!!!!!!!!! Умоляю!!!!!!! помогите!!!!!!!
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