a+3(a-1)=3(2+1)

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Solution for a+3(a-1)=3(2+1) equation: 



a+3(a-1)=3(2+1)

We move all terms to the left:

a+3(a-1)-(3(2+1))=0

We add all the numbers together, and all the variables

a+3(a-1)-(33)=0

We add all the numbers together, and all the variables

a+3(a-1)-33=0

We multiply parentheses

a+3a-3-33=0

We add all the numbers together, and all the variables

4a-36=0

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

4a=36

a=36/4

a=9

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