That is called "factoring".
You cannot write an algebraic expression for that, you need an equation. The equation is n - 6 = 4
It is n + 14.
Write the following as an algebraic expression using x as the variable: The sum of a number and -8
n + 4
n + 7
As an algebraic expression it is: 2x-9
m + 4
The algebraic expression is n + 100, where n is the unknown number.
As a algebraic expression it is simply n/8
X = " a number " X + 20
x3 + 4x