13=42-x

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Solution for 13=42-x equation: 



13=42-x

We move all terms to the left:

13-(42-x)=0

We add all the numbers together, and all the variables

-(-1x+42)+13=0

We get rid of parentheses

1x-42+13=0

We add all the numbers together, and all the variables

x-29=0

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

x=29

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