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6=r/2+4
We move all terms to the left:
6-(r/2+4)=0
We get rid of parentheses
-r/2-4+6=0
We multiply all the terms by the denominator
-r-4*2+6*2=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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