19=x-21

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Solution for 19=x-21 equation: 



19=x-21

We move all terms to the left:

19-(x-21)=0

We get rid of parentheses

-x+21+19=0

We add all the numbers together, and all the variables

-1x+40=0

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

-x=-40

x=-40/-1

x=+40

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