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-216=-6(1-5r)

We move all terms to the left:

-216-(-6(1-5r))=0

We add all the numbers together, and all the variables

-(-6(-5r+1))-216=0

We calculate terms in parentheses: -(-6(-5r+1)), so:We get rid of parentheses

-6(-5r+1)

We multiply parentheses

30r-6

Back to the equation:

-(30r-6)

-30r+6-216=0

We add all the numbers together, and all the variables

-30r-210=0

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

-30r=210

r=210/-30

r=-7

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