21=56+x

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Solution for 21=56+x equation: 



21=56+x

We move all terms to the left:

21-(56+x)=0

We add all the numbers together, and all the variables

-(x+56)+21=0

We get rid of parentheses

-x-56+21=0

We add all the numbers together, and all the variables

-1x-35=0

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

-x=35

x=35/-1

x=-35

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