81=a-9

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Solution for 81=a-9 equation: 



81=a-9

We move all terms to the left:

81-(a-9)=0

We get rid of parentheses

-a+9+81=0

We add all the numbers together, and all the variables

-1a+90=0

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

-a=-90

a=-90/-1

a=+90

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