Решить уравнение 2/3-(7/9-a)=1/3
2/3-(7/9-a)=1/3
7/9-а=2/3-1/3
7/9-а=1/3
а=7/9-1/3
а= 7-3
9
а=4/9
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2/3-(7/9-a)=1/3
7/9-а=2/3-1/3
7/9-а=1/3
а=7/9-1/3
а= 7-3
9
а=4/9