Magic equations

Example

+
+
=
28
 
+
+
=
44
 
-
+
=
 
 
+
+
=
12
 
 
 
 
 
 
 
 

Solution

+
+
=
28
 
+
+
=
44
 
-
+
=
28
 
+
+
=
12
 
 
 
4
 
12
 
20
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Magic equations
Magic equations

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