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Stiind ca: X+2xY+Z=17 si X+Y=10 determinati y+z
CORONITA 5 STELE 10 PUNCTE MULTUMESC
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Răspuns :

x+2·y+z = 17
x+y = 10
x+2y + z = x+y+y+z = 10+y+z
10+y+z = 17
y+z = 17-10
y+z = 7