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daca x+y=8 si y+2z=35 sa se calcu

leze : 3y-2x+10z


Răspuns :

x+y=8 => x=8-y
y+2z=35 => 2z=35-y
3y-2x+10z=3y-2*(8-y)+5(35-y)=3y-16+2y+175-5y=159