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16+8r=4r-4r
We move all terms to the left:
16+8r-(4r-4r)=0
We add all the numbers together, and all the variables
8r+16-0=0
We add all the numbers together, and all the variables
8r+16=0
We move all terms containing r to the left, all other terms to the right
8r=-16
r=-16/8
r=-2
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