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Calculati pe y+z daca x-3y+z=-8si 2x-5y+3z=6

Răspuns :

x-3y+z=-8
2x-5y+3z=6
x+z=-8+3y
2x+2z-5y+z=6
2 (x+y)-5y+z=6
2 (-8+3y)-5y+z=6
-16+6y-5y+z=6
y+z=6+16
y+z=22