Answer:
12x
Step-by-step explanation:
You can add the like terms (which have x)
5x+7x=12x
 
        
             
        
        
        
800 
+	60 
+	3 
+ 0.1
+ 0.04
+ 0.001
        
             
        
        
        
Answer:
Step-by-step explanation:
9=-d+17
(add d to both sides because it is the opposite of subtracting)
9+d=17
(subtract 9 from both sides because it is the opposite of adding)
d=17-9=8
 
        
                    
             
        
        
        
Answer:
no idea too hard but try  math          way 
Step-by-step explanation: