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-12r+4=1+
We move all terms to the left:
-12r+4-(1+)=0
We add all the numbers together, and all the variables
-12r+4-0=0
We add all the numbers together, and all the variables
-12r+4=0
We move all terms containing r to the left, all other terms to the right
-12r=-4
r=-4/-12
r=1/3
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