21=45-8-x

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Solution for 21=45-8-x equation: 



21=45-8-x

We move all terms to the left:

21-(45-8-x)=0

We add all the numbers together, and all the variables

-(-1x+37)+21=0

We get rid of parentheses

1x-37+21=0

We add all the numbers together, and all the variables

x-16=0

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

x=16

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