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-2+4r=-6+2r
We move all terms to the left:
-2+4r-(-6+2r)=0
We add all the numbers together, and all the variables
4r-(2r-6)-2=0
We get rid of parentheses
4r-2r+6-2=0
We add all the numbers together, and all the variables
2r+4=0
We move all terms containing r to the left, all other terms to the right
2r=-4
r=-4/2
r=-2
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