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Daca x + 2y + 3z= 130 ; x+3y+2z=135,atunci 5x +13y +12z =?

Răspuns :

x + 2y + 3z = 130 | (*2) -> 2x +4y +6z = 260
x + 3y+ 2z = 135 | (*3) -> 3x + 9y +6z = 405
Adunam cele doua relatii si obtinem: 5x + 13y + 12z = 665