I'm probably wrong but here you go!
A. a + ( - a)
Because it’s the same thing as: a - a
And if you plug in any value for example:
2 - 2 that would be 0
<span>Let x be the number. By the given above, the relationship between the numbers and the newly-introduced variable is expressed as (2/5)(x) = 14. To determine the value of x, divide 14 by 2/5. This will give us the answer which is equal to 35. Hence, the answer to this item is 35. </span>

Solution:
Given data:
and 
To find
:

Distributive property: 



Arrange and add/subtract same powers.


Hence 
Answer:
x = 1 
Step-by-step explanation:
Expressing the diagram as an equation , that is
6x - 3 = 4
=
( multiply through by 2 to clear the fraction )
12x - 6 = 9 ( add 6 to both sides )
12x = 15 ( divide both sides by 12 )
x =
=
= 1 