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(4r-6)-3r=12
We move all terms to the left:
(4r-6)-3r-(12)=0
We add all the numbers together, and all the variables
-3r+(4r-6)-12=0
We get rid of parentheses
-3r+4r-6-12=0
We add all the numbers together, and all the variables
r-18=0
We move all terms containing r to the left, all other terms to the right
r=18
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