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-8-r=-3r
We move all terms to the left:
-8-r-(-3r)=0
We add all the numbers together, and all the variables
-1r-(-3r)-8=0
We get rid of parentheses
-1r+3r-8=0
We add all the numbers together, and all the variables
2r-8=0
We move all terms containing r to the left, all other terms to the right
2r=8
r=8/2
r=4
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