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2=12-2r
We move all terms to the left:
2-(12-2r)=0
We add all the numbers together, and all the variables
-(-2r+12)+2=0
We get rid of parentheses
2r-12+2=0
We add all the numbers together, and all the variables
2r-10=0
We move all terms containing r to the left, all other terms to the right
2r=10
r=10/2
r=5
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