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4x+10y+3z stiind ca 2x+3y=17 si 4y+3z=74

Răspuns :

(2x+3y=17)×2⇒4x+6y=34

4x+6y=34

4y+3z=74
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le adunam

4x+10y+3z=34+74⇒

4x+10y+3z=108