x-(-12)=21

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Solution for x-(-12)=21 equation: 



x-(-12)=21

We move all terms to the left:

x-(-12)-(21)=0

determiningTheFunctionDomain
x-21-(-12)=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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