X*26=180 subtract 26 from 180 then you will find x.
 
        
             
        
        
        
Proportionally?  Not sure.  But here is a way to find out the value of x
50° + 2x+40 +4x+8 = 180°
Combine like terms
50°+ 6x + 48=180
  (now subtract 50° from both sides)
6x + 48 = 130°
(now subtract 48 from both sides
6x=82°  
x= 13.6666667° (repeating decimal)
        
             
        
        
        
Answer:
Step-by-step explanation:
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Addition should be the answer to your question