131=8-3(1+7r)

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Solution for 131=8-3(1+7r) equation: 



131=8-3(1+7r)

We move all terms to the left:

131-(8-3(1+7r))=0

We add all the numbers together, and all the variables

-(8-3(7r+1))+131=0



We calculate terms in parentheses: -(8-3(7r+1)), so:

8-3(7r+1)

determiningTheFunctionDomain
-3(7r+1)+8

We multiply parentheses

-21r-3+8

We add all the numbers together, and all the variables

-21r+5

Back to the equation:

-(-21r+5)



We get rid of parentheses

21r-5+131=0

We add all the numbers together, and all the variables

21r+126=0

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

21r=-126

r=-126/21

r=-6

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