I explained this to some as, "values from from right to left across the equals sign. In this case 10 flows into a, 20 flows into b, then the value of b, 20, flo

I explained this to some as, "values from from right to left across the equals sign. In this case 10 flows into a, 20 flows into b, then the value of b, 20, flows into a, making a 20 and b 20." I think it's a matter of saying what '=' means in words that people can understand since it doesn't mean '=' in the mathematically sense (which is '==' or '===' depending on language).