180=(x-20)+x

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Solution for 180=(x-20)+x equation: 



180=(x-20)+x

We move all terms to the left:

180-((x-20)+x)=0



We calculate terms in parentheses: -((x-20)+x), so:

(x-20)+x

We add all the numbers together, and all the variables

x+(x-20)

We get rid of parentheses

x+x-20

We add all the numbers together, and all the variables

2x-20

Back to the equation:

-(2x-20)



We get rid of parentheses

-2x+20+180=0

We add all the numbers together, and all the variables

-2x+200=0

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

-2x=-200

x=-200/-2

x=+100

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