-99=-1-7(7-r)

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Solution for -99=-1-7(7-r) equation: 



-99=-1-7(7-r)

We move all terms to the left:

-99-(-1-7(7-r))=0

We add all the numbers together, and all the variables

-(-1-7(-1r+7))-99=0



We calculate terms in parentheses: -(-1-7(-1r+7)), so:

-1-7(-1r+7)

determiningTheFunctionDomain
-7(-1r+7)-1

We multiply parentheses

7r-49-1

We add all the numbers together, and all the variables

7r-50

Back to the equation:

-(7r-50)



We get rid of parentheses

-7r+50-99=0

We add all the numbers together, and all the variables

-7r-49=0

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

-7r=49

r=49/-7

r=-7

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