How to:
a+b-mx=0
a+b=mx
(a+b)/x=m
        
             
        
        
        
1 solution.
This is referred to as a conditional equation.
        
             
        
        
        
Kelly has $10
- half: $10 - 1/2 x $10
$10 - $5 = $5
- one third: $5 - 1/3 x $5
$5 - $1.6667... or $5 - $1 and 2/3 = $3.33... or $3 and 1/3 or $10/3
She will have left $3.33 left, or $3 and 1/3