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3(6a+12)=90

We move all terms to the left:

3(6a+12)-(90)=0

We multiply parentheses

18a+36-90=0

We add all the numbers together, and all the variables

18a-54=0

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

18a=54

a=54/18

a=3

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