x+(-8)=21

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Solution for x+(-8)=21 equation: 



x+(-8)=21

We move all terms to the left:

x+(-8)-(21)=0

determiningTheFunctionDomain
x-21+(-8)=0

We add all the numbers together, and all the variables

x-29=0

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

x=29

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