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2r-5r-13=-19-4r
We move all terms to the left:
2r-5r-13-(-19-4r)=0
We add all the numbers together, and all the variables
2r-5r-(-4r-19)-13=0
We add all the numbers together, and all the variables
-3r-(-4r-19)-13=0
We get rid of parentheses
-3r+4r+19-13=0
We add all the numbers together, and all the variables
r+6=0
We move all terms containing r to the left, all other terms to the right
r=-6
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