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