21=112-x

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Solution for 21=112-x equation: 



21=112-x

We move all terms to the left:

21-(112-x)=0

We add all the numbers together, and all the variables

-(-1x+112)+21=0

We get rid of parentheses

1x-112+21=0

We add all the numbers together, and all the variables

x-91=0

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

x=91

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