-18=-3(r+2)

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Solution for -18=-3(r+2) equation: 



-18=-3(r+2)

We move all terms to the left:

-18-(-3(r+2))=0



We calculate terms in parentheses: -(-3(r+2)), so:

-3(r+2)

We multiply parentheses

-3r-6

Back to the equation:

-(-3r-6)



We get rid of parentheses

3r+6-18=0

We add all the numbers together, and all the variables

3r-12=0

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

3r=12

r=12/3

r=4

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