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the reason you use letters in algebraic expressions is because you don't know the number so a letter replaces it.
use a calculator
x+x use inverse operations
Numerical Expression: 1.) 20+2-8 ( Or any other number with two symbols on math ) Algebraic Expression: 2.) h x 2 ( Or any other number using only one symbol an a letter ) The difference between a numerical and algebraic expressions is that numerical expressions use only numbers, but algebraic expressions use letters as variables to represent numbers.
2-9h+6-5n use h=3 and n=2