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5=r+4+2
We move all terms to the left:
5-(r+4+2)=0
We add all the numbers together, and all the variables
-(r+6)+5=0
We get rid of parentheses
-r-6+5=0
We add all the numbers together, and all the variables
-1r-1=0
We move all terms containing r to the left, all other terms to the right
-r=1
r=1/-1
r=-1
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