x-21+21=6+21

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Solution for x-21+21=6+21 equation: 



x-21+21=6+21

We move all terms to the left:

x-21+21-(6+21)=0

We add all the numbers together, and all the variables

x-21+21-27=0

We add all the numbers together, and all the variables

x-27=0

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

x=27

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