21-9=

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Solution for 21-9= equation:


21-9=0

We simplify the equation to the form, which is simple to understand 
21-9=0

We move all terms containing  to the left and all other terms to the right. 
0=0-21+9

We simplify left and right side of the equation. 
0=-12

0=-12

The left and right sides are not equal, therefore there is no solution. This equation is invalid.

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