-18=-9(r-2)

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Solution for -18=-9(r-2) equation: 



-18=-9(r-2)

We move all terms to the left:

-18-(-9(r-2))=0



We calculate terms in parentheses: -(-9(r-2)), so:

-9(r-2)

We multiply parentheses

-9r+18

Back to the equation:

-(-9r+18)



We get rid of parentheses

9r-18-18=0

We add all the numbers together, and all the variables

9r-36=0

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

9r=36

r=36/9

r=4

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