21=x-4

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Solution for 21=x-4 equation: 



21=x-4

We move all terms to the left:

21-(x-4)=0

We get rid of parentheses

-x+4+21=0

We add all the numbers together, and all the variables

-1x+25=0

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

-x=-25

x=-25/-1

x=+25

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