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r/2+7=6
We move all terms to the left:
r/2+7-(6)=0
We add all the numbers together, and all the variables
r/2+1=0
We multiply all the terms by the denominator
r+1*2=0
We add all the numbers together, and all the variables
r+2=0
We move all terms containing r to the left, all other terms to the right
r=-2
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