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-16=-6r+2r
We move all terms to the left:
-16-(-6r+2r)=0
We add all the numbers together, and all the variables
-(-4r)-16=0
We get rid of parentheses
4r-16=0
We move all terms containing r to the left, all other terms to the right
4r=16
r=16/4
r=4
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