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-48+8r=-4r
We move all terms to the left:
-48+8r-(-4r)=0
We get rid of parentheses
8r+4r-48=0
We add all the numbers together, and all the variables
12r-48=0
We move all terms containing r to the left, all other terms to the right
12r=48
r=48/12
r=4
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