1 answer:
            
              
              
                
                
 12.50+0.40e=14.75+0.25e
-12.50             -12.50        Subtract 12.50 to elimanate on the right side to isolate e
 0.40e=2.25+0.25e          left from subtracting 12/50
-0.25            -0.25e           subtract 0.25e to put e on one side.
0.15e=2.25                         left from subtracting 0.25 e
0.15e/0.15=2.25/0.15          divide to isolate e and to get you're answer
e=15
Hope it helps!                    
 
                                
             
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