3=r-15

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Solution for 3=r-15 equation: 



3=r-15

We move all terms to the left:

3-(r-15)=0

We get rid of parentheses

-r+15+3=0

We add all the numbers together, and all the variables

-1r+18=0

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

-r=-18

r=-18/-1

r=+18

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