x+(2x+21)=108

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Solution for x+(2x+21)=108 equation: 



x+(2x+21)=108

We move all terms to the left:

x+(2x+21)-(108)=0

We get rid of parentheses

x+2x+21-108=0

We add all the numbers together, and all the variables

3x-87=0

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

3x=87

x=87/3

x=29

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