8r=18-r

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Solution for 8r=18-r equation: 



8r=18-r

We move all terms to the left:

8r-(18-r)=0

We add all the numbers together, and all the variables

8r-(-1r+18)=0

We get rid of parentheses

8r+1r-18=0

We add all the numbers together, and all the variables

9r-18=0

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

9r=18

r=18/9

r=2

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