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-4r-4=-7r-10
We move all terms to the left:
-4r-4-(-7r-10)=0
We get rid of parentheses
-4r+7r+10-4=0
We add all the numbers together, and all the variables
3r+6=0
We move all terms containing r to the left, all other terms to the right
3r=-6
r=-6/3
r=-2
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