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16-(r/7)=221
We move all terms to the left:
16-(r/7)-(221)=0
We add all the numbers together, and all the variables
-(+r/7)+16-221=0
We add all the numbers together, and all the variables
-(+r/7)-205=0
We get rid of parentheses
-r/7-205=0
We multiply all the terms by the denominator
-r-205*7=0
We add all the numbers together, and all the variables
-1r-1435=0
We move all terms containing r to the left, all other terms to the right
-r=1435
r=1435/-1
r=-1435
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