(30-r)=15

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Solution for (30-r)=15 equation: 



(30-r)=15

We move all terms to the left:

(30-r)-(15)=0

We add all the numbers together, and all the variables

(-1r+30)-15=0

We get rid of parentheses

-1r+30-15=0

We add all the numbers together, and all the variables

-1r+15=0

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

-r=-15

r=-15/-1

r=+15

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