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[tex] \left \{ {{2x+2y=360} \atop {2x+y=260}} \right. [/tex]

Răspuns :

din a doua relatie y=260-2x, inlocuim in prima

2x+2(260-2x)=360
2x+520-4x=360
-2x=-160, x=80, y=260-160=100