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