13-2x=x+21

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Solution for 13-2x=x+21 equation: 



13-2x=x+21

We move all terms to the left:

13-2x-(x+21)=0

We get rid of parentheses

-2x-x-21+13=0

We add all the numbers together, and all the variables

-3x-8=0

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

-3x=8

x=8/-3

x=-2+2/3

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