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Bok do góry=3x+y
Bok na dole=2y+7
Bok z lewej=x-y
Bok z prawej=2x+y
jeśli to prostokąt, to Bok z lewej=Bok z prawej
x-y=2x+y
i Bok do góry=Bok na dole
3x+y=2y+7
czyli:
x-y=2x+y
3x+y=2y+7
-x=2y
3x-7=y
-x=2(3x-7)
-x=6x-14
-7x=-14
x=2
-2=2y
y=-1
boki:x-y=2-(-1)=3
2y+7=-2+7=5
P=3*5=15