107=-5+7(7-3r)

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Solution for 107=-5+7(7-3r) equation: 



107=-5+7(7-3r)

We move all terms to the left:

107-(-5+7(7-3r))=0

We add all the numbers together, and all the variables

-(-5+7(-3r+7))+107=0



We calculate terms in parentheses: -(-5+7(-3r+7)), so:

-5+7(-3r+7)

determiningTheFunctionDomain
7(-3r+7)-5

We multiply parentheses

-21r+49-5

We add all the numbers together, and all the variables

-21r+44

Back to the equation:

-(-21r+44)



We get rid of parentheses

21r-44+107=0

We add all the numbers together, and all the variables

21r+63=0

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

21r=-63

r=-63/21

r=-3

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