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13+4r-14=5r-20
We move all terms to the left:
13+4r-14-(5r-20)=0
We add all the numbers together, and all the variables
4r-(5r-20)-1=0
We get rid of parentheses
4r-5r+20-1=0
We add all the numbers together, and all the variables
-1r+19=0
We move all terms containing r to the left, all other terms to the right
-r=-19
r=-19/-1
r=+19
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