(A)3x-3+9=12+15

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Solution for (A)3x-3+9=12+15 equation: 



()3A-3+9=12+15

We move all terms to the left:

()3A-3+9-(12+15)=0

We add all the numbers together, and all the variables

()3A-3+9-27=0

We add all the numbers together, and all the variables

()3A-21=0

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

()3A=21

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