Răspuns :
( x + 4 y + 2 z ) + ( 3 x + 2 z ) = 13 + 11
x + 4 y + 2 z + 3 x + 2 z = 24
4 x + 4 y + 4 z = 24
4 × ( x + y + z ) = 24
x + y + z = 24 : 4
x + y + z = 6
( x + 4 y + 2 z ) + ( 3 x + 2 z ) = 13 + 11
x + 4 y + 2 z + 3 x + 2 z = 24
4 x + 4 y + 4 z = 24
4 × ( x + y + z ) = 24
x + y + z = 24 : 4
x + y + z = 6