x+10=2x-21

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Solution for x+10=2x-21 equation: 



x+10=2x-21

We move all terms to the left:

x+10-(2x-21)=0

We get rid of parentheses

x-2x+21+10=0

We add all the numbers together, and all the variables

-1x+31=0

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

-x=-31

x=-31/-1

x=+31

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