-216=4(2-7r)

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Solution for -216=4(2-7r) equation: 



-216=4(2-7r)

We move all terms to the left:

-216-(4(2-7r))=0

We add all the numbers together, and all the variables

-(4(-7r+2))-216=0



We calculate terms in parentheses: -(4(-7r+2)), so:

4(-7r+2)

We multiply parentheses

-28r+8

Back to the equation:

-(-28r+8)



We get rid of parentheses

28r-8-216=0

We add all the numbers together, and all the variables

28r-224=0

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

28r=224

r=224/28

r=8

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