8a-9=81

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Solution for 8a-9=81 equation: 



8a-9=81

We move all terms to the left:

8a-9-(81)=0

We add all the numbers together, and all the variables

8a-90=0

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

8a=90

a=90/8

a=11+1/4

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