-21+16-4=

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Solution for -21+16-4= equation:


-21+16-4=0

We simplify the equation to the form, which is simple to understand 
-21+16-4=0

We move all terms containing  to the left and all other terms to the right. 
0=0+21-16+4

We simplify left and right side of the equation. 
0=+9

0=9

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

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