7+7+7=3x

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



7+7+7=3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3x+21=0

We move all terms containing x to the left, all other terms to the right

-3x=-21

x=-21/-3

x=+7

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