8a-9=8*10-9

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Solution for 8a-9=8*10-9 equation: 



8a-9=8*10-9

We move all terms to the left:

8a-9-(8*10-9)=0

We add all the numbers together, and all the variables

8a-9-71=0

We add all the numbers together, and all the variables

8a-80=0

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

8a=80

a=80/8

a=10

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