15=30-r

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Solution for 15=30-r equation: 



15=30-r

We move all terms to the left:

15-(30-r)=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

r-15=0

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

r=15

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