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b-szerokość
Obw.=68cm
2cm+a=3b
a=3b-2cm
Obw.=2a+2b
68cm=2(3b-2cm)+2b
68cm=6b-4cm+2b
8b=68cm+4cm
8b=72cm /8
b=9cm
a=3b-2cm=3*9cm-2cm=27cm-2cm=25cm