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Stiind ca:
xy+xz+5x=485si y+z=92,determinati x


Răspuns :

x(y+z+5)=485
x(92+5)=485
x*97=485
x=485:97
x=5
xy+xz+5x=485
x(y+z+5)=485
x(92+5)=485
x*97=485
x=485:97
x=5