r=312-r

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Solution for r=312-r equation: 



r=312-r

We move all terms to the left:

r-(312-r)=0

We add all the numbers together, and all the variables

r-(-1r+312)=0

We get rid of parentheses

r+1r-312=0

We add all the numbers together, and all the variables

2r-312=0

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

2r=312

r=312/2

r=156

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