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x+y=10 si y+3z=26 Calculati 2x+5y+9z

Răspuns :

2x+5y+9z=
2x+2y+3y+9z=
10x2+26x3=
20+78=
98
sper ca te am ajutat
x+y=10|x2
y+3z=26|x3

2x+2y=20
3y+9z=78
-----------------
2x+5y+9z=98