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y - dłuższy bok
{x+y=150
{x+15=y
x+x+15=150
2x=135
x= 67,5
y= 67,5+15
y= 82,5
zakładam że ta działka to prostokąt
150m :2=75m
15m:2=7,5m
75m+7,5m=82,5m
75m-7,5m=67,5m
82,5m+67,5m=150m