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x,y,z xz + 7yz + z = 49
x + 7y = 6


Răspuns :

xz+7yz+z=49
x+7y=6
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x,y,z
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La prima ecuatie scoatem factor comun  z .
z(x+7y+1)=49
z*7=49
z=7
x+7y=6
x=-1
y=1