-18=-3-3r

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Solution for -18=-3-3r equation: 



-18=-3-3r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3r+3-18=0

We add all the numbers together, and all the variables

3r-15=0

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

3r=15

r=15/3

r=5

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