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12=4-6r+8
We move all terms to the left:
12-(4-6r+8)=0
We add all the numbers together, and all the variables
-(-6r+12)+12=0
We get rid of parentheses
6r-12+12=0
We add all the numbers together, and all the variables
6r=0
r=0/6
r=0
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