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a+b= 654
c=b+128
2a+b+c=?


Răspuns :

b=654-a
c=b+128
inlocuim b:
654-a+128

••••••••••••••••

2a+654-a+654-a+128=
=654+654+128=
=1 308+128=
=1436


Succes! :)