6(2y+7)=3(3y+221)
12y+42=9y+63
12y-9y=63-42
3y=21 /:3
y=7
obwód
6(2y+7)=6(2*7+7)=6(14+7)=6*21=126
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6(2y+7)=3(3y+221)
12y+42=9y+63
12y-9y=63-42
3y=21 /:3
y=7
obwód
6(2y+7)=6(2*7+7)=6(14+7)=6*21=126