7x-7=217x-7=21

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Solution for 7x-7=217x-7=21 equation: 



7x-7=217x-7=21

We move all terms to the left:

7x-7-(217x-7)=0

We get rid of parentheses

7x-217x+7-7=0

We add all the numbers together, and all the variables

-210x=0

x=0/-210

x=0

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