13+7=31-x

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Solution for 13+7=31-x equation: 



13+7=31-x

We move all terms to the left:

13+7-(31-x)=0

We add all the numbers together, and all the variables

-(-1x+31)+13+7=0

We add all the numbers together, and all the variables

-(-1x+31)+20=0

We get rid of parentheses

1x-31+20=0

We add all the numbers together, and all the variables

x-11=0

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

x=11

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