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r/12+2=-2
We move all terms to the left:
r/12+2-(-2)=0
We add all the numbers together, and all the variables
r/12+4=0
We multiply all the terms by the denominator
r+4*12=0
We add all the numbers together, and all the variables
r+48=0
We move all terms containing r to the left, all other terms to the right
r=-48
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