3d - e = 7d + e = 5   ⇒   3d - e = 5 
                                       7d + e = 5
 3d - e = 5 
 7d + e = 5          +
-----------------------
10d / = 10
10d = 10
d = 10/10
d = 1
 7d + e = 5
7×1 + e = 5
7 + e = 5
e = 5 - 7
e = -2
        
             
        
        
        
Answer:
x=63
Step-by-step explanation:
 
        
                    
             
        
        
        
I swear brainly needs to make it harder to create accounts 2
        
             
        
        
        
3A+2B=20
2A+B=13 ➡×(-2)➡-4A-2B=-26
3A+2B-4A-2B=20-26
-A=-6 ➡A=6
2(6)+B=13➡B=1