18=-3(r-4)

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Solution for 18=-3(r-4) equation: 



18=-3(r-4)

We move all terms to the left:

18-(-3(r-4))=0



We calculate terms in parentheses: -(-3(r-4)), so:

-3(r-4)

We multiply parentheses

-3r+12

Back to the equation:

-(-3r+12)



We get rid of parentheses

3r-12+18=0

We add all the numbers together, and all the variables

3r+6=0

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

3r=-6

r=-6/3

r=-2

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