21=16+x

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Solution for 21=16+x equation: 



21=16+x

We move all terms to the left:

21-(16+x)=0

We add all the numbers together, and all the variables

-(x+16)+21=0

We get rid of parentheses

-x-16+21=0

We add all the numbers together, and all the variables

-1x+5=0

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

-x=-5

x=-5/-1

x=+5

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