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-4r-(6r-6)=-6-4r
We move all terms to the left:
-4r-(6r-6)-(-6-4r)=0
We add all the numbers together, and all the variables
-4r-(6r-6)-(-4r-6)=0
We get rid of parentheses
-4r-6r+4r+6+6=0
We add all the numbers together, and all the variables
-6r+12=0
We move all terms containing r to the left, all other terms to the right
-6r=-12
r=-12/-6
r=+2
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