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'''Abstract thinking:'''<br>
 
'''Abstract thinking:'''<br>
 
b) a (q<br>
 
b) a (q<br>
 
+
<br>
  -bq<br>
+
-bq<br>
---------  
+
---------<br>
 
(a - bq)<br>
 
(a - bq)<br>
 
---------
 
---------
13

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