(2x+21)+x=x

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Solution for (2x+21)+x=x equation: 



(2x+21)+x=x

We move all terms to the left:

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

We add all the numbers together, and all the variables

(2x+21)=0

We get rid of parentheses

2x+21=0

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

2x=-21

x=-21/2

x=-10+1/2

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