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-1-3r=-4-(r+7)
We move all terms to the left:
-1-3r-(-4-(r+7))=0
We calculate terms in parentheses: -(-4-(r+7)), so:We get rid of parentheses
-4-(r+7)
determiningTheFunctionDomain -(r+7)-4
We get rid of parentheses
-r-7-4
We add all the numbers together, and all the variables
-1r-11
Back to the equation:
-(-1r-11)
-3r+1r+11-1=0
We add all the numbers together, and all the variables
-2r+10=0
We move all terms containing r to the left, all other terms to the right
-2r=-10
r=-10/-2
r=+5
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