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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-2(a+1)), so:

-2(a+1)

We multiply parentheses

-2a-2

Back to the equation:

-(-2a-2)



We get rid of parentheses

-1a+2a+2-9=0

We add all the numbers together, and all the variables

a-7=0

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

a=7

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