-18=2-4r

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Solution for -18=2-4r equation: 



-18=2-4r

We move all terms to the left:

-18-(2-4r)=0

We add all the numbers together, and all the variables

-(-4r+2)-18=0

We get rid of parentheses

4r-2-18=0

We add all the numbers together, and all the variables

4r-20=0

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

4r=20

r=20/4

r=5

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