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4=r/4
We move all terms to the left:
4-(r/4)=0
We add all the numbers together, and all the variables
-(+r/4)+4=0
We get rid of parentheses
-r/4+4=0
We multiply all the terms by the denominator
-r+4*4=0
We add all the numbers together, and all the variables
-1r+16=0
We move all terms containing r to the left, all other terms to the right
-r=-16
r=-16/-1
r=+16
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