21--5=-8

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Solution for 21--5=-8 equation:


21--5=-8

We simplify the equation to the form, which is simple to understand 
21+5=-8

We move all terms containing  to the left and all other terms to the right. 
0=-8-21-5

We simplify left and right side of the equation. 
0=-34

0=-34

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

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