x+18=180-x

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Solution for x+18=180-x equation: 



x+18=180-x

We move all terms to the left:

x+18-(180-x)=0

We add all the numbers together, and all the variables

x-(-1x+180)+18=0

We get rid of parentheses

x+1x-180+18=0

We add all the numbers together, and all the variables

2x-162=0

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

2x=162

x=162/2

x=81

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