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b-krotszy bok
b=a-6
5b=2a+2b
5(a-6)=2a+2(a-6)
5a-30=2a+2a-12
5a-2a-2a=-12+30
a=18
b=a-6=18-6=12
a=18 b=12
P=a×b=18×12=216 j²
odp: pole jest równe 216 j²