2 7/9*(2/5х+3/5х) =2 2/92 7/9х=2 2/925/9х=20/9х=4/5=0,8
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2 7/9*(2/5х+3/5х) =2 2/9
2 7/9х=2 2/9
25/9х=20/9
х=4/5=0,8