-42=-2(r+9)

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Solution for -42=-2(r+9) equation: 



-42=-2(r+9)

We move all terms to the left:

-42-(-2(r+9))=0



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

-2(r+9)

We multiply parentheses

-2r-18

Back to the equation:

-(-2r-18)



We get rid of parentheses

2r+18-42=0

We add all the numbers together, and all the variables

2r-24=0

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

2r=24

r=24/2

r=12

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