21=38-x

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Solution for 21=38-x equation: 



21=38-x

We move all terms to the left:

21-(38-x)=0

We add all the numbers together, and all the variables

-(-1x+38)+21=0

We get rid of parentheses

1x-38+21=0

We add all the numbers together, and all the variables

x-17=0

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

x=17

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