r-15=12,r

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Solution for r-15=12,r equation: 



r-15=12.r

We move all terms to the left:

r-15-(12.r)=0

We add all the numbers together, and all the variables

r-(+12.r)-15=0

We get rid of parentheses

r-12.r-15=0

We add all the numbers together, and all the variables

-11r-15=0

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

-11r=15

r=15/-11

r=-1+4/11

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