a+(-9)=12

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Solution for a+(-9)=12 equation: 



a+(-9)=12

We move all terms to the left:

a+(-9)-(12)=0

determiningTheFunctionDomain
a-12+(-9)=0

We add all the numbers together, and all the variables

a-21=0

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

a=21

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