Dart chart

Example

 
 
+3
 
 
 
 
.2
 
.3
 
 
 
 
+12
 
 

Solution

 
 
+3
 
 
 
3
6
 
.2
 
.3
 
6
18
 
 
 
+12
 
 
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Dart chart
Dart chart

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