39=x-21

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Solution for 39=x-21 equation: 



39=x-21

We move all terms to the left:

39-(x-21)=0

We get rid of parentheses

-x+21+39=0

We add all the numbers together, and all the variables

-1x+60=0

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

-x=-60

x=-60/-1

x=+60

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