a+9=12(21)

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Solution for a+9=12(21) equation: 



a+9=12(21)

We move all terms to the left:

a+9-(12(21))=0

determiningTheFunctionDomain
a+9-1221=0

We add all the numbers together, and all the variables

a-1212=0

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

a=1212

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