(x-31)+(x-31)+42=180

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Solution for (x-31)+(x-31)+42=180 equation: 



(x-31)+(x-31)+42=180

We move all terms to the left:

(x-31)+(x-31)+42-(180)=0

We add all the numbers together, and all the variables

(x-31)+(x-31)-138=0

We get rid of parentheses

x+x-31-31-138=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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