x+(x+21)+(x-6)=180

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Solution for x+(x+21)+(x-6)=180 equation: 



x+(x+21)+(x-6)=180

We move all terms to the left:

x+(x+21)+(x-6)-(180)=0

We get rid of parentheses

x+x+x+21-6-180=0

We add all the numbers together, and all the variables

3x-165=0

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

3x=165

x=165/3

x=55

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