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y-waga ptaka
{y=x-0,9
2y=x+0,7
{y=x-0,9
2*(x-0,9)=x+0,7
{y=x-0,9
2x-1,8=x+0,7
{y=x-0,9
x=2,5
y=2,5-0,9=1,6
odp.ptak waży 1,6 grama