8=4(r-91)

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Solution for 8=4(r-91) equation: 



8=4(r-91)

We move all terms to the left:

8-(4(r-91))=0



We calculate terms in parentheses: -(4(r-91)), so:

4(r-91)

We multiply parentheses

4r-364

Back to the equation:

-(4r-364)



We get rid of parentheses

-4r+364+8=0

We add all the numbers together, and all the variables

-4r+372=0

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

-4r=-372

r=-372/-4

r=+93

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