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(X+3)*(y+3)=xy+d
xy+2y+2x=xy+16
2y+2x=16
y+x=8
xy+2y+2x=xy+16
xy+3y+3x+9=xy+d
-y-x-9=-16+d
y+x+9=-16+d
33=d
pole zwiekszy sie o 33 cm kwadr