8=7(r-2)+1

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Solution for 8=7(r-2)+1 equation: 



8=7(r-2)+1

We move all terms to the left:

8-(7(r-2)+1)=0



We calculate terms in parentheses: -(7(r-2)+1), so:

7(r-2)+1

We multiply parentheses

7r-14+1

We add all the numbers together, and all the variables

7r-13

Back to the equation:

-(7r-13)



We get rid of parentheses

-7r+13+8=0

We add all the numbers together, and all the variables

-7r+21=0

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

-7r=-21

r=-21/-7

r=+3

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