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2014-08-20T03:28:39+05:30

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WRITE the numbers on a horizontal line
       21  ------------------------  X ---------------------------------- 71

 X is as much greater than 21 as it is less than 71.

It means X is in the center of the two numbers: 21 and 71.

So X  =  ( 21 + 71 ) /2  =  92 / 2  =  46
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USUAL method

   X - 21  =  71 - X            take - X to L H S and bring - 21 to R H S

   So  X + X  =  71 + 21

         2 X = 92                    X = 92 /2 =  46

2 3 2