21=2+7(r-5)

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Solution for 21=2+7(r-5) equation: 



21=2+7(r-5)

We move all terms to the left:

21-(2+7(r-5))=0



We calculate terms in parentheses: -(2+7(r-5)), so:

2+7(r-5)

determiningTheFunctionDomain
7(r-5)+2

We multiply parentheses

7r-35+2

We add all the numbers together, and all the variables

7r-33

Back to the equation:

-(7r-33)



We get rid of parentheses

-7r+33+21=0

We add all the numbers together, and all the variables

-7r+54=0

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

-7r=-54

r=-54/-7

r=7+5/7

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