12=1-2r-1

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Solution for 12=1-2r-1 equation:



12=1-2r-1
We move all terms to the left:
12-(1-2r-1)=0
We add all the numbers together, and all the variables
-(-2r)+12=0
We get rid of parentheses
2r+12=0
We move all terms containing r to the left, all other terms to the right
2r=-12
r=-12/2
r=-6

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