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r/4+2=-1+r
We move all terms to the left:
r/4+2-(-1+r)=0
We add all the numbers together, and all the variables
r/4-(r-1)+2=0
We get rid of parentheses
r/4-r+1+2=0
We multiply all the terms by the denominator
r-r*4+1*4+2*4=0
We add all the numbers together, and all the variables
r-r*4+12=0
Wy multiply elements
r-4r+12=0
We add all the numbers together, and all the variables
-3r+12=0
We move all terms containing r to the left, all other terms to the right
-3r=-12
r=-12/-3
r=+4
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