180=(42-x)+(138-x)

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Solution for 180=(42-x)+(138-x) equation: 



180=(42-x)+(138-x)

We move all terms to the left:

180-((42-x)+(138-x))=0

We add all the numbers together, and all the variables

-((-1x+42)+(-1x+138))+180=0



We calculate terms in parentheses: -((-1x+42)+(-1x+138)), so:

(-1x+42)+(-1x+138)

We get rid of parentheses

-1x-1x+42+138

We add all the numbers together, and all the variables

-2x+180

Back to the equation:

-(-2x+180)



We get rid of parentheses

2x-180+180=0

We add all the numbers together, and all the variables

2x=0

x=0/2

x=0

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