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Daca xy+xz-5x=60 si x=6,calculeaza 3y+3z

Răspuns :

x(y+z)-5•6=60
x(y+z)-30=60
x(y+z)=90
6(y+z)=90
y+z=90:6
y+z=15
=> 3(y+z)=15•3=45