72=3a-3(6a+6)

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Solution for 72=3a-3(6a+6) equation: 



72=3a-3(6a+6)

We move all terms to the left:

72-(3a-3(6a+6))=0



We calculate terms in parentheses: -(3a-3(6a+6)), so:

3a-3(6a+6)

We multiply parentheses

3a-18a-18

We add all the numbers together, and all the variables

-15a-18

Back to the equation:

-(-15a-18)



We get rid of parentheses

15a+18+72=0

We add all the numbers together, and all the variables

15a+90=0

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

15a=-90

a=-90/15

a=-6

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