3(a+3)+6=30

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Solution for 3(a+3)+6=30 equation: 



3(a+3)+6=30

We move all terms to the left:

3(a+3)+6-(30)=0

We add all the numbers together, and all the variables

3(a+3)-24=0

We multiply parentheses

3a+9-24=0

We add all the numbers together, and all the variables

3a-15=0

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

3a=15

a=15/3

a=5

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