9(x+-4)=81

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Solution for 9(x+-4)=81 equation: 



9(x+-4)=81

We move all terms to the left:

9(x+-4)-(81)=0

We add all the numbers together, and all the variables

9(x-4)-81=0

We multiply parentheses

9x-36-81=0

We add all the numbers together, and all the variables

9x-117=0

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

9x=117

x=117/9

x=13

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