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12-(r1/5)=2r+1
We move all terms to the left:
12-(r1/5)-(2r+1)=0
We add all the numbers together, and all the variables
-(+r1/5)-(2r+1)+12=0
We get rid of parentheses
-r1/5-2r-1+12=0
We multiply all the terms by the denominator
-r1-2r*5-1*5+12*5=0
We add all the numbers together, and all the variables
-1r-2r*5+55=0
Wy multiply elements
-1r-10r+55=0
We add all the numbers together, and all the variables
-11r+55=0
We move all terms containing r to the left, all other terms to the right
-11r=-55
r=-55/-11
r=+5
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