3(a+7)+3a=39

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Solution for 3(a+7)+3a=39 equation: 



3(a+7)+3a=39

We move all terms to the left:

3(a+7)+3a-(39)=0

We add all the numbers together, and all the variables

3a+3(a+7)-39=0

We multiply parentheses

3a+3a+21-39=0

We add all the numbers together, and all the variables

6a-18=0

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

6a=18

a=18/6

a=3

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