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7=r-0.003
We move all terms to the left:
7-(r-0.003)=0
We get rid of parentheses
-r+0.003+7=0
We add all the numbers together, and all the variables
-1r+7.003=0
We move all terms containing r to the left, all other terms to the right
-r=-7.003
r=-7.003/-1
r=7+0.0030000000000001/1
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