378=-7(9r-9)

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Solution for 378=-7(9r-9) equation: 



378=-7(9r-9)

We move all terms to the left:

378-(-7(9r-9))=0



We calculate terms in parentheses: -(-7(9r-9)), so:

-7(9r-9)

We multiply parentheses

-63r+63

Back to the equation:

-(-63r+63)



We get rid of parentheses

63r-63+378=0

We add all the numbers together, and all the variables

63r+315=0

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

63r=-315

r=-315/63

r=-5

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