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