[ Answer ]

[ Explanation ]
4 + 3 + 7 ___ 7 + 0 + 7
Solve Each Side:
4 + 3 + 7 = 14
7 + 0 + 7 = 14
14 __ 14
14 is equal to 14, therefore the __ (Or ?) is replaced with an = sign.
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Answer:
x = 13
Step-by-step explanation:
First start with the blank equation

Plug in the legs and hypotenuse. Remember c squared is always the hypotenuse.

Then solve
25 + 144 = 
169 =

c = 13
The answer is 91 and the property used is the Identity Property of Addition.