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2r-4=-(r+6)
We move all terms to the left:
2r-4-(-(r+6))=0
We calculate terms in parentheses: -(-(r+6)), so:We get rid of parentheses
-(r+6)
We get rid of parentheses
-r-6
We add all the numbers together, and all the variables
-1r-6
Back to the equation:
-(-1r-6)
2r+1r+6-4=0
We add all the numbers together, and all the variables
3r+2=0
We move all terms containing r to the left, all other terms to the right
3r=-2
r=-2/3
r=-2/3
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