x+8=2x-21

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Solution for x+8=2x-21 equation: 



x+8=2x-21

We move all terms to the left:

x+8-(2x-21)=0

We get rid of parentheses

x-2x+21+8=0

We add all the numbers together, and all the variables

-1x+29=0

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

-x=-29

x=-29/-1

x=+29

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