2x+y+z+x+2y+z+x+y+2z=71cm+72cm+73cm
4x+4y+4z=216cm
4×(x+y+z)=216cm
x+y+z=216cm:4
x+y+z=54cm
Inlocuim in prima relatie:
x+x+y+z=71cm
x+54cm=71cm⇒x=71cm-54cm
x=17cm
Inlocuim in a doua relatie:
x+y+y+z=72cm
54cm+y=72cm⇒y=72cm-54cm
y=18cm
Inlocuim si in a treia relatie:
x+y+z+z=73cm
54cm+z=73cm⇒z=73cm-54cm
z=19cm