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-4r-28=-2r-48
We move all terms to the left:
-4r-28-(-2r-48)=0
We get rid of parentheses
-4r+2r+48-28=0
We add all the numbers together, and all the variables
-2r+20=0
We move all terms containing r to the left, all other terms to the right
-2r=-20
r=-20/-2
r=+10
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