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4=r-1/2
We move all terms to the left:
4-(r-1/2)=0
We add all the numbers together, and all the variables
-(+r-1/2)+4=0
We get rid of parentheses
-r+4+1/2=0
We multiply all the terms by the denominator
-r*2+1+4*2=0
We add all the numbers together, and all the variables
-r*2+9=0
Wy multiply elements
-2r+9=0
We move all terms containing r to the left, all other terms to the right
-2r=-9
r=-9/-2
r=4+1/2
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