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8=3+r
We move all terms to the left:
8-(3+r)=0
We add all the numbers together, and all the variables
-(r+3)+8=0
We get rid of parentheses
-r-3+8=0
We add all the numbers together, and all the variables
-1r+5=0
We move all terms containing r to the left, all other terms to the right
-r=-5
r=-5/-1
r=+5
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