I think this is the Transitive postulate of equality.
Personally I can't see much point in giving labels to these equalities.
Answer:
The answer is - Transitive postulate of equality
Step-by-step explanation:
This property states, If a = b and b = c , then a = c.
So, here the given figure depicts, Transitive postulate of equality. A transitive property in mathematics is a relation that extends over things in a particular way.
x= 68
Hope i could help ^_^
-24
6
First, subtract 9 on both sides:
d+9-9=15-9
d=6
Hope this helped!