Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhas
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
Answer:
x = 15
Explanation:
The angle is 90 degrees, so 3x qnd 4x - 15 combined would equal 90.
Combining like terms would turn the equation into 7x-15 = 90. 
Add 15: 7x = 105
Divide 105 by 7, and x = 15
 
                                
             
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