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x+9 -drugi bok
x(x+9)=216
x kwadrat +9x =216
x=10,873m jeden bok
10,873+9=19,873m drugi bok
x-jeden bok
x+15 -drugi bok
x(x+15)=216
x kwadrat +15x =216
x=9m jeden bok
9m+15m = 24m - drugi bok