12/21+28/21=

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Solution for 12/21+28/21= equation:


12/21+28/21=0

We simplify the equation to the form, which is simple to understand 
12/21+28/21=0

We move all terms containing  to the left and all other terms to the right. 
0=0-0.57142857142857-1.3333333333333

We simplify left and right side of the equation. 
0=-1.9047619047619

0=-1.9047619047619

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

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