3a+6a=27+9

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Solution for 3a+6a=27+9 equation: 



3a+6a=27+9

We move all terms to the left:

3a+6a-(27+9)=0

We add all the numbers together, and all the variables

3a+6a-36=0

We add all the numbers together, and all the variables

9a-36=0

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

9a=36

a=36/9

a=4

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