0,6-y/9=1,3-y/4,5
-y/9+y/4,5=1,3-0,6
-y/9+2*y/9=0,7
у/9=0,7
у=9*0,7
у=6,3
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0,6-y/9=1,3-y/4,5
-y/9+y/4,5=1,3-0,6
-y/9+2*y/9=0,7
у/9=0,7
у=9*0,7
у=6,3