3x+7=3x-21

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Solution for 3x+7=3x-21 equation: 



3x+7=3x-21

We move all terms to the left:

3x+7-(3x-21)=0

We get rid of parentheses

3x-3x+21+7=0

We add all the numbers together, and all the variables

28!=0

There is no solution for this equation

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