7+7+7=

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Solution for 7+7+7= equation:


7+7+7=0

We simplify the equation to the form, which is simple to understand 
7+7+7=0

We move all terms containing  to the left and all other terms to the right. 
0=0-7-7-7

We simplify left and right side of the equation. 
0=-21

0=-21

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

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