2/3 + 3/4 + 5/8......common denominator is 24
16/24 + 18/24 + 15/24 = 49/24 (or 2 1/24)
The simplified equation of
is 
<h3>How to determine the simplified equation?</h3>
The complete question is added as an attachment
The equation is given as

Subtract (x - 10)^2 from both sides

Evaluate 4^2

Take the square root of both sides

Add 6 to both sides

Hence, the simplified equation of
is 
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That would be the SSS postulate.
3/9 simplifies into 1/3 because you can still divide the top and bottom by 3