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-30=0

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

3a=30

a=30/3

a=10

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