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359=28r+23
We move all terms to the left:
359-(28r+23)=0
We get rid of parentheses
-28r-23+359=0
We add all the numbers together, and all the variables
-28r+336=0
We move all terms containing r to the left, all other terms to the right
-28r=-336
r=-336/-28
r=+12
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