15=x-21

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Solution for 15=x-21 equation: 



15=x-21

We move all terms to the left:

15-(x-21)=0

We get rid of parentheses

-x+21+15=0

We add all the numbers together, and all the variables

-1x+36=0

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

-x=-36

x=-36/-1

x=+36

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