-9=7+2(a-3)

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Solution for -9=7+2(a-3) equation: 



-9=7+2(a-3)

We move all terms to the left:

-9-(7+2(a-3))=0



We calculate terms in parentheses: -(7+2(a-3)), so:

7+2(a-3)

determiningTheFunctionDomain
2(a-3)+7

We multiply parentheses

2a-6+7

We add all the numbers together, and all the variables

2a+1

Back to the equation:

-(2a+1)



We get rid of parentheses

-2a-1-9=0

We add all the numbers together, and all the variables

-2a-10=0

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

-2a=10

a=10/-2

a=-5

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