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-8r-2=4r-10r+8
We move all terms to the left:
-8r-2-(4r-10r+8)=0
We add all the numbers together, and all the variables
-8r-(-6r+8)-2=0
We get rid of parentheses
-8r+6r-8-2=0
We add all the numbers together, and all the variables
-2r-10=0
We move all terms containing r to the left, all other terms to the right
-2r=10
r=10/-2
r=-5
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