x+7=2x-21-7

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Solution for x+7=2x-21-7 equation: 



x+7=2x-21-7

We move all terms to the left:

x+7-(2x-21-7)=0

We add all the numbers together, and all the variables

x-(2x-28)+7=0

We get rid of parentheses

x-2x+28+7=0

We add all the numbers together, and all the variables

-1x+35=0

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

-x=-35

x=-35/-1

x=+35

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