<h2>
Answer:</h2>
 .
.
<h2>
Step-by-step explanation:</h2>
<h3>1. Write the expression.</h3>

<h3>2. Substitute y for x, and x for y.</h3>

<h3>3. Solve for y.</h3>

<h3>4. Express your result.</h3>
 .
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Answer:
10x^3+9x^2-9
Step-by-step explanation:
8x^3+2x-2+9x^2-7+2x-2x^3 - Combine like terms
10x^3+9x^2-9
 
        
                    
             
        
        
        
Step-by-step explanation:
One hundred minus five n
 
        
             
        
        
        
Answer:
D
Step-by-step explanation: