x+(x-21)=108

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Solution for x+(x-21)=108 equation: 



x+(x-21)=108

We move all terms to the left:

x+(x-21)-(108)=0

We get rid of parentheses

x+x-21-108=0

We add all the numbers together, and all the variables

2x-129=0

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

2x=129

x=129/2

x=64+1/2

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