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L=2a+2b
Krótszy bok (a) 2x = 9cm (2*4,5=9)
Dłuższy bok (b) 3x=13,5cm (3*4,5=13,5)
45=2(2x)+2(3x)
45=4x+6x
10x=45
x=4,5
Sprawdzenie
L=2*9+2*13,5
L=18+27
L=45cm