3(a+3)=21

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



3(a+3)=21

We move all terms to the left:

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

We multiply parentheses

3a+9-21=0

We add all the numbers together, and all the variables

3a-12=0

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

3a=12

a=12/3

a=4

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