a-3+a+a-3+a=30
4a-6=30
4a=30+6
4a=36
a=36/4
a=9
9-3=6
6*9=54
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a-3+a+a-3+a=30
4a-6=30
4a=30+6
4a=36
a=36/4
a=9
9-3=6
6*9=54
S=54см в кв.