The first law of organic chemistry is well known: if you mix 1 kg of straw with 1 kg of straw, you get 2 kg of straw.
During the session, the first generalized law of organic chemistry was developed:
If you mix n kg of strawberries and m kg of strawberries, you will get (m+n) kg of strawberries.
Note: if m strives to zero, then they can be ignored, but it is better not to do so.