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-1/2+r=7/2
We move all terms to the left:
-1/2+r-(7/2)=0
We add all the numbers together, and all the variables
r-1/2-(+7/2)=0
We get rid of parentheses
r-1/2-7/2=0
We multiply all the terms by the denominator
r*2-1-7=0
We add all the numbers together, and all the variables
r*2-8=0
Wy multiply elements
2r-8=0
We move all terms containing r to the left, all other terms to the right
2r=8
r=8/2
r=4
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