(x-40)+(x-31)=x

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Solution for (x-40)+(x-31)=x equation: 



(x-40)+(x-31)=x

We move all terms to the left:

(x-40)+(x-31)-(x)=0

We add all the numbers together, and all the variables

-1x+(x-40)+(x-31)=0

We get rid of parentheses

-1x+x+x-40-31=0

We add all the numbers together, and all the variables

x-71=0

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

x=71

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