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Calculati y+z stiind ca x-3y+z=-8 si 2x-5y+3z=6 xyz∈R

Răspuns :

[tex] \left \{ {{2x-6y+2z=-16} \atop {2x-5y+3z=6}} \right. [/tex]⇒-y-z=-22⇒y+z=22