Hi  



 (5-3x^2 )-(5x^2+3)-(7+x^2 )

Removing Parenthesis

 5 -3x^2 - 5x^2 -3  -7 -x^2 

combine Like terms to simplify

-3x^2 - 5x^2 -x^2  -3  -7 + 5  

-9x^2 -5

0r

-(9x^2 + 5) 

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