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ReplaceAll and rules from a list v7.0


Hi,

Suppose I have the equation

x=a+b

and the list

l={{1,1},{2,2},{3,3}}

How can I quickly assign the list to the above equation, that is, I
would like to get the following result

{2,4,6}

The first element of each sub-list should be assigned to a and the
second to b.

Thanks in advance.
Kristoph


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