2a-(8a-1)-5(a+2)=9

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Solution for 2a-(8a-1)-5(a+2)=9 equation: 



2a-(8a-1)-5(a+2)=9

We move all terms to the left:

2a-(8a-1)-5(a+2)-(9)=0

We multiply parentheses

2a-(8a-1)-5a-10-9=0

We get rid of parentheses

2a-8a-5a+1-10-9=0

We add all the numbers together, and all the variables

-11a-18=0

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

-11a=18

a=18/-11

a=-1+7/11

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