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9=r/16
We move all terms to the left:
9-(r/16)=0
We add all the numbers together, and all the variables
-(+r/16)+9=0
We get rid of parentheses
-r/16+9=0
We multiply all the terms by the denominator
-r+9*16=0
We add all the numbers together, and all the variables
-1r+144=0
We move all terms containing r to the left, all other terms to the right
-r=-144
r=-144/-1
r=+144
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