I think the answer would be negative 3
        
             
        
        
        
Answer:
I have no clue 
Step-by-step explanation:
i dont lnow
 
        
             
        
        
        
Answer:
a = -15, b = -.5, c = -1
Step-by-step explanation:
1/3a = -5 --> multiply each side with 3 --> a = -15
12 - b = 12.5 --> subtract 12 from both sides --> -b = .5 --> multiply each side with -1 to get b positive --> b = -.5
.1 = -10c --> multiply each side with -10 --> c = -1
 
        
             
        
        
        
Answer:
add x to both sides. once you do this, you will get x+y=15