Mutual annihilation of terms - what is it?

Question

Mathematics

What up, programmer.
What is mutual annihilation of terms?
You can have a number of examples, and preferably in the simplest language. And can you somehow draw an analogy with real life?

Answer 1

YES! This is an annihilation.
666+x=x+666
:)
1. A car accident with a frontal collision at equal speeds with equal masses.
2. Lightning discharge
3. The transformation of a neutron star into a "black hole"

Answer 2

Damn this pass in elementary school go study

Answer 3

This is what causes (a+b)*(a^2-a*b+b^2)=a^3-b^3. Four terms - a^2*b, -a^2*b, a*b^2, -a*b^2 add up to 0, and they are not visible in the final formula. Like that gopher.