2(3a+3)=21+3a

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Solution for 2(3a+3)=21+3a equation: 



2(3a+3)=21+3a

We move all terms to the left:

2(3a+3)-(21+3a)=0

We add all the numbers together, and all the variables

2(3a+3)-(3a+21)=0

We multiply parentheses

6a-(3a+21)+6=0

We get rid of parentheses

6a-3a-21+6=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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