A number means an arbitrary variable, let's call it x.
The sum of a number and itself means adding the number to itself
x + x
Simplified, we have 2x
The word is means equal to, so we have an algebraic expression of:
2x= 8
IF you need to solve this equation, divide each side by 2
x = 4
The sum of a number and itself means adding the number to itself
x + x
Simplified, we have 2x
The word is means equal to, so we have an algebraic expression of:
2x= 8
IF you need to solve this equation, divide each side by 2
x = 4