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-21-2r=-5-3
We move all terms to the left:
-21-2r-(-5-3)=0
We add all the numbers together, and all the variables
-2r-21-(-8)=0
We add all the numbers together, and all the variables
-2r-13=0
We move all terms containing r to the left, all other terms to the right
-2r=13
r=13/-2
r=-6+1/2
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