9(a-4)=81

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Solution for 9(a-4)=81 equation: 



9(a-4)=81

We move all terms to the left:

9(a-4)-(81)=0

We multiply parentheses

9a-36-81=0

We add all the numbers together, and all the variables

9a-117=0

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

9a=117

a=117/9

a=13

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