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y=x+5cm
z=x+8cm+5cm
1.8m=180cm
180cm=3x+5cm+8cm
3x=180cm-5cm-8cm-5cm
3x=162cm
x=54cm
y=54cm+5cm
y=59cm
z=54cm+5cm+8cm
z=67cm
180=3x+18
180-18=3x
162=3x <------ dzielisz na 3
x=54cm <---- pierwszy kawałek
54+5=59cm <------ drugi kawałek
59+8=67cm <---- trzeci kawałek