8*-4-2*-21=

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Solution for 8*-4-2*-21= equation:


8*-4-2*-21=0

We simplify the equation to the form, which is simple to understand 
8*-4-2*-21=0

We move all terms containing  to the left and all other terms to the right. 
0=0-32+42

We simplify left and right side of the equation. 
0=+10

0=10

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

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