длина x, ширина y
x-y=1
2x+2y=30
x=1+y
2(1+y)+2y=30
2+2y+2y=30
4y=30-2
4y=28
y=7
x=1+7=8
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длина x, ширина y
x-y=1
2x+2y=30
x=1+y
2(1+y)+2y=30
2+2y+2y=30
4y=30-2
4y=28
y=7
x=1+7=8