216=8(-1+4r)

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Solution for 216=8(-1+4r) equation: 



216=8(-1+4r)

We move all terms to the left:

216-(8(-1+4r))=0

We add all the numbers together, and all the variables

-(8(4r-1))+216=0



We calculate terms in parentheses: -(8(4r-1)), so:

8(4r-1)

We multiply parentheses

32r-8

Back to the equation:

-(32r-8)



We get rid of parentheses

-32r+8+216=0

We add all the numbers together, and all the variables

-32r+224=0

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

-32r=-224

r=-224/-32

r=+7

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