21--12=

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Solution for 21--12= equation:


21--12=0

We simplify the equation to the form, which is simple to understand 
21+12=0

We move all terms containing  to the left and all other terms to the right. 
0=0-21-12

We simplify left and right side of the equation. 
0=-33

0=-33

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

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