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12r-3r+4=5r-16
We move all terms to the left:
12r-3r+4-(5r-16)=0
We add all the numbers together, and all the variables
9r-(5r-16)+4=0
We get rid of parentheses
9r-5r+16+4=0
We add all the numbers together, and all the variables
4r+20=0
We move all terms containing r to the left, all other terms to the right
4r=-20
r=-20/4
r=-5
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