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-8+2r-6r=-8r-4r
We move all terms to the left:
-8+2r-6r-(-8r-4r)=0
We add all the numbers together, and all the variables
2r-6r-(-12r)-8=0
We add all the numbers together, and all the variables
-4r-(-12r)-8=0
We get rid of parentheses
-4r+12r-8=0
We add all the numbers together, and all the variables
8r-8=0
We move all terms containing r to the left, all other terms to the right
8r=8
r=8/8
r=1
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