7x=x-21

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Solution for 7x=x-21 equation: 



7x=x-21

We move all terms to the left:

7x-(x-21)=0

We get rid of parentheses

7x-x+21=0

We add all the numbers together, and all the variables

6x+21=0

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

6x=-21

x=-21/6

x=-3+1/2

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