1-21+8=x

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Solution for 1-21+8=x equation: 



1-21+8=x

We move all terms to the left:

1-21+8-(x)=0

We add all the numbers together, and all the variables

-1x-12=0

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

-x=12

x=12/-1

x=-12

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