33% times 90 would be $29.7
        
             
        
        
        
You want to use the addition property, so you need to ADD each term. Just change the minuses to pluses, making sure you keep the negative with the number
5x-8x-7y+y =
5x + -8x + -7y +y
 
        
             
        
        
        
Here's number 5. If you need more explanation just let me know.
 
        
        
        
2x - 9x = 14 (Careful next time you accidentally added an "equal" next to the 2)
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Simplify
2x-9x=<span>14
</span><span>2x+-9x</span>=<span>14
</span>--------------------------------------------
Combine the like-terms
<span>(<span>2x+-9x</span>)</span>=<span>14
</span><span><span>-7x</span></span>=<span>14
</span>--------------------------------------------------
Now divide -7 to each side
-7x ÷ -7 = 14 ÷ -7
x = -2
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x = -2 is your answer
        
             
        
        
        
The 3rd one would be correct