-20=2+7(a-9)

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Solution for -20=2+7(a-9) equation: 



-20=2+7(a-9)

We move all terms to the left:

-20-(2+7(a-9))=0



We calculate terms in parentheses: -(2+7(a-9)), so:

2+7(a-9)

determiningTheFunctionDomain
7(a-9)+2

We multiply parentheses

7a-63+2

We add all the numbers together, and all the variables

7a-61

Back to the equation:

-(7a-61)



We get rid of parentheses

-7a+61-20=0

We add all the numbers together, and all the variables

-7a+41=0

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

-7a=-41

a=-41/-7

a=5+6/7

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