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-2r-4r=-3-7r+4r
We move all terms to the left:
-2r-4r-(-3-7r+4r)=0
We add all the numbers together, and all the variables
-2r-4r-(-3r-3)=0
We add all the numbers together, and all the variables
-6r-(-3r-3)=0
We get rid of parentheses
-6r+3r+3=0
We add all the numbers together, and all the variables
-3r+3=0
We move all terms containing r to the left, all other terms to the right
-3r=-3
r=-3/-3
r=1
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