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4-5r=-(r+4)
We move all terms to the left:
4-5r-(-(r+4))=0
We calculate terms in parentheses: -(-(r+4)), so:We get rid of parentheses
-(r+4)
We get rid of parentheses
-r-4
We add all the numbers together, and all the variables
-1r-4
Back to the equation:
-(-1r-4)
-5r+1r+4+4=0
We add all the numbers together, and all the variables
-4r+8=0
We move all terms containing r to the left, all other terms to the right
-4r=-8
r=-8/-4
r=+2
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