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30=r/5+240
We move all terms to the left:
30-(r/5+240)=0
We get rid of parentheses
-r/5-240+30=0
We multiply all the terms by the denominator
-r-240*5+30*5=0
We add all the numbers together, and all the variables
-1r-1050=0
We move all terms containing r to the left, all other terms to the right
-r=1050
r=1050/-1
r=-1050
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