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5r-4=12+r
We move all terms to the left:
5r-4-(12+r)=0
We add all the numbers together, and all the variables
5r-(r+12)-4=0
We get rid of parentheses
5r-r-12-4=0
We add all the numbers together, and all the variables
4r-16=0
We move all terms containing r to the left, all other terms to the right
4r=16
r=16/4
r=4
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