7x-7=21-5x

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Solution for 7x-7=21-5x equation: 



7x-7=21-5x

We move all terms to the left:

7x-7-(21-5x)=0

We add all the numbers together, and all the variables

7x-(-5x+21)-7=0

We get rid of parentheses

7x+5x-21-7=0

We add all the numbers together, and all the variables

12x-28=0

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

12x=28

x=28/12

x=2+1/3

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