-217=-7-7(2-7r)

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Solution for -217=-7-7(2-7r) equation: 



-217=-7-7(2-7r)

We move all terms to the left:

-217-(-7-7(2-7r))=0

We add all the numbers together, and all the variables

-(-7-7(-7r+2))-217=0



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

-7-7(-7r+2)

determiningTheFunctionDomain
-7(-7r+2)-7

We multiply parentheses

49r-14-7

We add all the numbers together, and all the variables

49r-21

Back to the equation:

-(49r-21)



We get rid of parentheses

-49r+21-217=0

We add all the numbers together, and all the variables

-49r-196=0

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

-49r=196

r=196/-49

r=-4

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