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r+1/2=6-1/2
We move all terms to the left:
r+1/2-(6-1/2)=0
We add all the numbers together, and all the variables
r+1/2-(-1/2+6)=0
We get rid of parentheses
r-6+1/2+1/2=0
We multiply all the terms by the denominator
r*2+1+1-6*2=0
We add all the numbers together, and all the variables
r*2-10=0
Wy multiply elements
2r-10=0
We move all terms containing r to the left, all other terms to the right
2r=10
r=10/2
r=5
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