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Line 141: Line 141:  
4b = 4<br>
 
4b = 4<br>
 
b = 1<br>
 
b = 1<br>
Consider equation 2,
+
Consider equation 2<br>
   −
a + b = 10b
+
a + b = 10b<br>
Put b = 1
+
Put b = 1<br>
a + (1) = 10 (1)
+
a + (1) = 10 (1)<br>
a + 1 = 10
+
a + 1 = 10<br>
a = 10-1
+
a = 10-1<br>
 
a = 9
 
a = 9
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