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Determinati x,y,z. Stiind ca
x+y+z=54
x-y=y
z=x+y


Răspuns :

x+y+z=54
x+y=z               => z+z=54   => z=54:2       z=27

x-y=y   => x=2y
x+y=27
2y+y=27
3y=27=y=27:3
y=9
x=2x9
x=18