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6a+6=8a
2a=6
a=3
pole=a*8=24
zmieniło sie o 2
b-krótszy bok prostokata
4cm*b=4cm*(b-1cm) /4cm
b/4cm=b-1cm /*4
b=4b-4cm
-3b=-4cm
b=4/3cm
Pole prostokata= 4/3cm*6cm=24/3cm²=8cm²