3 8/9 -у=2 7/9; (х-3 13/21)+2 10/21=7 2/21

[latex]1) 3 \frac{8}{9}-y=2 \frac{7}{9} [/latex] [latex]y=3 \frac{8}{9}-2 \frac{7}{9} [/latex] [latex]y=1 \frac{1}{9} [/latex] [latex]2)(x-3 \frac{13}{21})+2 \frac{10}{21}=7 \frac{2}{21} [/latex] [latex]x-3 \frac{13}{21}=6 \frac{23}{21}-2 \frac{10}{21} [/latex] [latex]x-3 \frac{13}{21}=4 \frac{13}{21} [/latex] [latex]x=3 \frac{13}{21}+4 \frac{13}{21} [/latex] [latex]x=7 \frac{26}{21} [/latex] [latex]x=8 \frac{5}{21} [/latex]