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1=r/4+2
We move all terms to the left:
1-(r/4+2)=0
We get rid of parentheses
-r/4-2+1=0
We multiply all the terms by the denominator
-r-2*4+1*4=0
We add all the numbers together, and all the variables
-1r-4=0
We move all terms containing r to the left, all other terms to the right
-r=4
r=4/-1
r=-4
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